The WattPlan Podcast · Episode 25 · 9 min
How much sleep does a cyclist need?
Next episodes: What should you eat after a ride? · How do you read your Fitness chart? · How do you plan a season so you peak on the day?
Read the transcript
James. Hello, and welcome to the WattPlan Podcast. I'm James. Family, work, building WattPlan, a podium now and then, and a pile of sports science papers on the bedside table, which probably tells you something about this week's subject. How much sleep does a cyclist actually need, and what does a bad night really do to your riding? Lyra, our AI research voice, has been through the research, and every study is linked in the show notes.
Lyra. Most adults do best somewhere around seven to nine hours, and riders in a hard block may need the top of that. A short night does cost you performance. But how much depends on how you lost the sleep, how long the effort is, and even what time of day you ride.
James. Okay, give me the size of it. What does a bad night actually cost?
Lyra. The biggest review is a 2022 meta-analysis in Sports Medicine by Jonathan Craven and colleagues. It pulled together 69 publications comparing normal sleep with six hours or less. On average, performance dropped by about seven and a half percent, and every kind of exercise they looked at was affected. Worth knowing who was in it, though. Nearly nine in ten participants were men. [1]
James. Seven and a half percent. That's like knocking twenty watts off a two hundred and fifty watt FTP overnight.
Lyra. I'd stop you there. That's an average across sprints, strength, skill and endurance tests, not your FTP falling. The more useful part is the detail. The consistent drops came from a whole night without sleep, or from waking much earlier than usual. Going to bed late had a much less consistent effect.
James. Wait. So the five o'clock alarm is worse than the late night?
Lyra. In that review, yes. Cutting sleep at the end of the night hurt more reliably than starting it late. And performance fell a little more for every extra hour people had been awake before the test, about 0.4 percent an hour. There was a timing twist too. Tests in the afternoon and evening dropped, while morning tests were largely unaffected.
James. So after a rotten night, ride early and get it done.
Lyra. That's where the authors landed. If a short night is coming and you can't avoid it, steer clear of the very early start or a night with no sleep, and prioritise morning exercise. It's their advice from the pattern, not a trial built for cyclists.
James. Most of that is gym tests and sprints, though. What about the long stuff, the riding we actually do?
Lyra. That's the second review, from the European Journal of Sport Science at the end of 2022, by Thiago Lopes and colleagues. It looked only at endurance, thirty-one studies and 478 people. Losing sleep had a moderate negative effect, and efforts longer than thirty minutes were hit harder than shorter ones. Whether people were untrained or trained made little difference. [2]
James. Longer than thirty minutes. That's every sportive and every long ride.
Lyra. It is. With one caveat for the faster listeners. Most of the people in these studies weren't elite, so how much it applies at the very top is less clear.
James. Right, here's my problem with all of this. Loads of people have slept six and a half hours for years and ride perfectly well. Surely seven to nine is a bit of a myth?
Lyra. You're half right, and the third source is on your side. It's a 2021 expert consensus in the British Journal of Sports Medicine, led by Neil Walsh. It says elite sportspeople are especially prone to short sleep, under seven hours a night, and that a one-size-fits-all seven to nine hours is unlikely to be ideal. It recommends an individual approach, built around how much sleep you feel you need. [3]
James. So not a myth. Just not one number for everyone.
Lyra. Exactly. And it's candid about the gaps. A night or more without sleep clearly costs performance, but what one to three short nights do, the real-world version, it calls unclear. It says the studies lack women. And it asks for research into napping and into banking sleep before a big event. So when you hear about sleep banks, that's sensible practice, not tested fact. Nobody has tested that properly yet.
James. Does WattPlan know any of this about me? Can it tell when I've had a rotten night?
Lyra. The surest way is to tell the Coach. It's set up to treat what you tell it, legs, sleep, soreness, as a better guide to how you're coping than Form. And if you've slept badly before a long, hard session, it can swap that day for an easier one or make it a rest day, in the plan itself.
James. Does any of this matter if you're new to this? Or is it fine-tuning for people who race?
Lyra. If you're new to structured training, it's the cheapest gain you'll find. Same wake time most days, a cool, dark room, caffeine done by early afternoon. No numbers needed. If you train with power or heart rate, use the Lopes finding. After a short night, it's the long, sustained efforts that suffer most, so that's the session to move, not the short one.
James. And if you race? Everyone tells you the night before doesn't matter.
Lyra. If you race, our article agrees. Nerves the night before are normal, and the two or three nights before that matter more. WattPlan keeps your last few days light, with a short openers session the day before if you ride it. And with an early start, Craven's finding about early waking is the one to respect. Move your wake time earlier gradually in the days before, rather than springing a four-thirty alarm on race morning.
James. And in a big training block? Do I need more than usual, or is that just an excuse for a lie-in?
Lyra. Probably more, and it's a decent excuse. Harder training asks for more recovery, and our view is that a heavy block is when to err on the long side. And remember the consensus. Elite sportspeople are often under seven hours a night. If the people you'd think had it sorted have room to add some, most of us do too.
James. What about the tracker on my wrist? It gives me a score every morning and I can't tell if it means anything.
Lyra. Use it for the trend, not the night. Consumer devices estimate sleep stages, and they aren't medical-grade, so a single bad score tells you little. A run of short nights before your hard sessions tells you a lot more.
James. What about naps? I've never managed one that didn't leave me groggy.
Lyra. The usual advice is twenty to thirty minutes in the early afternoon, or a full ninety, and nothing after about four, so the nap doesn't steal from the night. The honest bit is the one we just covered. The consensus says napping still needs proper research. So treat it as something to try, not a fix.
James. And the stuff everyone says about screens, booze and a cold bedroom?
Lyra. The usual list is sensible. A cool room, around eighteen to twenty degrees. Screens off for the last hour or so. Alcohol can help you drop off but breaks up the second half of the night. None of it is exotic, and that's the point. Regular, dark, cool and boring wins.
James. Okay, what do I actually do this week?
Lyra. Three things. Pick a wake time and keep it all week, weekends included. Before each hard session, jot down roughly how you slept. And if a short night lands before a long, hard day, open the Coach and ask it to swap the session, rather than grinding through it.
James. Fixed wake time, a sleep note before the hard days, and swap the big session after a bad night instead of being a hero. I can manage that.
Lyra. Training sets the question, and sleep is where your body answers it. Protect the nights before your hardest days the way you'd protect the sessions themselves.
Lyra. The full article and every study we mentioned are on the WattPlan blog, linked in the show notes. And if you've enjoyed this, follow the WattPlan Podcast wherever you're listening, so you don't miss the next one.
James. And if you want a plan built around the time you've actually got, get WattPlan on the App Store or Google Play. Thanks for listening.
Voices produced with ElevenLabs. James's voice is a clone of his own, Lyra is an AI voice, and James reviews every episode.
You can optimise training, perfect nutrition, and dial in your equipment, but neglect sleep, and everything else works less effectively. Sleep isn't just rest. It's when your body adapts to training, repairs muscle damage, and consolidates the neural patterns that make you faster. Here's why sleep matters and how to get more of it.
Why does sleep matter for cyclists?
Sleep is an active process of restoration and adaptation. Several things happen while you sleep.
Growth hormone release peaks. The primary hormone for muscle repair and adaptation is released predominantly during deep sleep. Poor sleep means less recovery.
Repair continues. Muscle repair carries on overnight, and protein before bed helps it.
Neural consolidation occurs. Skills, coordination, and motor patterns are reinforced. Your brain processes training adaptations.
Recovery catches up. Riders who sleep badly for weeks tend to cope worse with hard training.
Hormonal balance resets. Testosterone, cortisol, and other hormones crucial for athletic performance are regulated during sleep.
How Sleep Affects Power Output
Research directly links sleep to cycling performance.
Sleep deprivation research finds these effects.
- Decreased time to exhaustion
- Lower peak power output
- Impaired sprint performance
- Reduced endurance capacity
- Slower reaction times
A 2022 review of 69 studies found that six hours of sleep or less cut exercise performance by about 7.6% on average (95% CI 3.1 to 11.9%), with the biggest drops after very early alarms or a night without sleep. Chronic sleep restriction has compounding effects.
Conversely. Riders who prioritise sleep show improved performance markers, faster recovery, and better training adaptation.
The relationship is dose-dependent, and more sleep (to a point) generally means better performance.
Sleep and Training Adaptation
Training provides the stimulus, and sleep provides the adaptation. This sequence matters.
- Training creates stress and micro-damage
- During sleep, repair processes activate
- The body adapts, becoming stronger
- You wake up with more capability than before
Skip or shorten the sleep phase, and adaptation is compromised. You've done the hard work but don't get the full benefit.
Practical implication. Hard training days require good sleep that night. Prioritise sleep following intense sessions.
How many hours of sleep do cyclists need?
General guidelines for adult riders are below.
| Sleep Duration | Impact |
|---|---|
| < 6 hours | Performance significantly impaired |
| 6-7 hours | Suboptimal, adequate for some individuals |
| 7-9 hours | Optimal range for most adults |
| 9-10 hours | May benefit high training loads |
| > 10 hours | Usually unnecessary for most riders |
Individual variation exists. Some people function well on 7 hours, and others need 9. Track your performance and subjective feelings to find your optimal duration.
Riders in hard training typically need more sleep than sedentary individuals due to increased recovery demands. During heavy training blocks, err on the side of more sleep.
Sleep Quality vs Quantity
Both matter. Eight hours of fragmented sleep may provide less recovery than seven hours of quality sleep.
Quality Markers
- Fall asleep within 15-20 minutes
- Few or brief awakenings
- Feeling refreshed upon waking
- Consistent energy through the day
- Natural wake without alarm
What Impairs Quality
- Screen use before bed
- Caffeine too late in the day
- Alcohol consumption
- Irregular schedule
- Uncomfortable environment
- Stress and anxiety
Pre-Race Sleep Strategies
Race weeks bring unique sleep challenges. The night before matters less than the nights before that.
Week Before Race
Prioritise consistent, quality sleep every night. Build a "sleep bank". You can't fully make up for sleep debt, but being well-rested going into race week helps.
2-3 Nights Before
These nights matter most. If you'll sleep poorly the night before due to nerves, earlier nights buffer this. Aim for 8+ hours.
Night Before Race
Accept that you might sleep less or worse. Nervousness is normal. Keep these in mind.
- Lying in bed resting still provides recovery benefits
- One night of suboptimal sleep won't destroy performance
- Avoid sleep aids unless tested in training
Race Morning
Early morning races often require waking before natural sleep cycles complete. These help.
- Gradually shift wake time earlier in the days before
- Use light exposure immediately upon waking
- Brief easy movement helps activate the system
Improving Your Sleep Hygiene
Sleep hygiene refers to habits and environment that promote quality sleep.
Environment
Temperature. Cool (around 18-20°C) promotes sleep. Bodies need to cool down to initiate sleep.
Darkness. Complete darkness signals sleep to the brain. Use blackout curtains, cover LEDs.
Quiet. Consistent quiet or white noise. Sudden sounds disrupt sleep more than constant noise.
Comfortable bedding. Invest in a good mattress and pillows. Riders spend significant recovery time in bed.
Timing
Consistent schedule. Go to bed and wake up at similar times daily. Circadian rhythms function best with regularity.
Wind-down routine. 30-60 minutes of relaxing activities before bed. Reading, stretching, meditation.
Avoid late training. Intense exercise close to bedtime can raise heart rate and body temperature, delaying sleep. Morning or afternoon training is ideal for most.
Pre-Sleep Habits
Limit screens. Blue light suppresses melatonin. Stop screens 1-2 hours before bed, or use blue-light filtering.
Caffeine cutoff. Individual sensitivity varies, but most riders should stop caffeine by early afternoon.
Alcohol caution. Alcohol might help you fall asleep but fragments later sleep cycles and reduces quality.
Light evening meal. Large or heavy meals can disrupt sleep. A light snack with protein is fine if hungry.
Napping for Riders
Strategic naps can supplement nighttime sleep.
When Naps Help
- Making up for short nighttime sleep
- During heavy training blocks
- After early morning sessions
- During travel and stage races
Optimal Nap Protocol
Duration. 20-30 minutes (power nap) or 90 minutes (full sleep cycle)
Timing. Early afternoon (1-3pm), aligned with natural circadian dip
Avoid. Napping after 4pm, which can impair nighttime sleep
Environment. Dark, cool and quiet, the same as nighttime
Nap Cautions
- Napping doesn't fully replace quality nighttime sleep
- Long naps close to bedtime create problems
- If you can't nap, quiet rest still provides some recovery
Sleep Tracking
Modern devices track sleep duration and quality. These metrics are useful.
Total sleep time. Whether you are getting enough.
Sleep efficiency. Time asleep vs. time in bed. Above 85% is good.
Sleep stages. Deep and REM sleep percentages. Most trackers estimate these with varying accuracy.
Trends. More valuable than single nights. Look for patterns.
Tracking Limitations
Consumer devices estimate sleep stages. They're not medical-grade. Use them for trends and rough assessment, not precise diagnosis.
HRV (heart rate variability) during sleep can indicate recovery status. High HRV generally suggests good recovery, and low or declining HRV may indicate accumulated stress.
Frequently Asked Questions
Can I bank sleep for later?
Partially. You can't stockpile sleep indefinitely, but being well-rested before a demanding period (race week, training camp) provides a buffer. Sleep debt, however, is harder to repay than to prevent.
Do I need more sleep during heavy training?
Probably. Higher training stress requires more recovery. Studies that measure elite riders' sleep find most get about seven hours or less, so there is usually room to add more.
Is it okay to use sleep aids?
Sleep aids, melatonin included, are a question for your doctor, and melatonin is prescription-only in the UK. Prescription sleep medications should be discussed with a doctor. Avoid relying on any aid regularly. It is better to address underlying sleep hygiene issues.
What if I can't sleep before a big race?
Don't panic. Lying quietly resting still provides recovery benefits. Your body has been prepared by the sleep of previous nights. Avoid stimulants and stay calm.
How does travel affect sleep?
Time zone changes disrupt circadian rhythms. Adjust your sleep schedule before travel, get light exposure at your destination, ask your doctor about jet lag if it is a big shift, and accept 1-2 days of adaptation for major time zone shifts.
Sleep is the foundation upon which all other recovery rests. Prioritise it like you prioritise training, because without quality sleep, even perfect training won't deliver optimal results.
Sources
- Effects of Acute Sleep Loss on Physical Performance: A Systematic and Meta-Analytical Review, Sports Medicine
- How much does sleep deprivation impair endurance performance? A systematic review and meta‐analysis, European Journal of Sport Science
- Sleep and the athlete: narrative review and 2021 expert consensus recommendations, British Journal of Sports Medicine