Does lack of sleep hurt your cycling performance?

Reviewed by Fred Laguía
Creator of «La Obsesión Ciclista de Fred», the most-listened Spanish-language cycling podcast (6M+ plays). 20+ years building technology, much of it for sport.
Prepared by the FredCoach science team, AI-assisted, from the cited sources · Recovery scientist

In short. Yes. In a meta-analysis of 69 studies, sleeping 6 hours or less before exercise cut performance by about 7–8 % on average; in endurance tests, like cycling, by around 5–6 %. The reverse has been seen too: in a small study of nine cyclists, three nights with more time in bed made a one-hour time trial almost two minutes faster.

A single short night already costs performance

It is the question of anyone who trains around work and family: I slept badly, should I still ride? A 2022 meta-analysis pooled 69 publications with almost a thousand participants who did the same physical test after normal sleep and after 6 hours or less. On average, performance dropped by 7.6 %, and the effect showed up in every type of exercise, including endurance, which is what cycling is about (there, 5.5 % less on average).

Two useful details:

• Cutting sleep at the end hurts more. The losses were consistent after a sleepless night or after waking earlier than usual; going to bed later and sleeping until your normal time showed no clear effect.
• Time of day matters less for endurance. Across all tests, the longer people had been awake before the effort, the worse, and early-morning tests were barely affected; but in endurance tests the drop showed up in the morning and in the afternoon alike.

How sure is this? It is a large meta-analysis, but the studies varied a lot and nearly nine in ten participants were men. The direction is clear; the exact percentage for you is not.

Does more sleep make you faster? A study of nine cyclists

An Australian team had nine cyclists and triathletes sleep three ways for three nights in a row: their usual sleep (about 6.5–7 hours), 30 % less time in bed (under 5 hours) and 30 % more (just over 8 hours). After each night they rode a time trial of roughly an hour.

• With restricted sleep they were slower by day three (60.4 vs 58.8 minutes) and in a worse mood.
• With extra time in bed they were faster by day four (56.8 vs 58.7 minutes).
• Perceived effort stayed the same: with more sleep, the same feeling bought more speed.

It is a small study, the kind that opens a question rather than settles it. But it fits the rest: a review of ten sleep-intervention studies in athletes found that extending sleep was what helped performance most, and the classic Stanford study of basketball players (2011) saw faster sprints and better shooting after weeks of aiming for more sleep. They are small studies in young people, and the Stanford one had no control group.

How much sleep does an amateur cyclist need?

For adult health, the American sleep medicine societies agreed on 7 hours or more, on a regular basis. Sleeping less, night after night, is linked to poorer health. The 2021 expert consensus on athlete sleep considers one number for everyone (such as 7–9 hours) unlikely to be ideal and recommends adjusting it to the sleep each person feels they need.

The same consensus is upfront about a gap: what really happens with partial cuts over one to three nights, the most real-life scenario, is unclear. A sleepless night is well studied; your week of 6-hour nights with a newborn, much less so.

Beyond performance: colds and HRV

In one experiment, 164 healthy adults had their sleep tracked with a wristband for a week and then received nose drops containing a cold virus. Those sleeping under 6 hours were about four times as likely to catch a cold as those sleeping over 7; between 6 and 7 hours the risk did not clearly rise. It is an association from one study, not proof of cause, but it points the same way as the consensus.

Short sleep also lowers HRV (heart rate variability), according to a meta-analysis of 11 trials with 549 people, none of them athletes (healthy adults, shift workers, doctors on call) and with very different ways of cutting sleep. So if your HRV has been low for a few days and your nights have been short, it makes sense to look at sleep first, before your fitness.

What to do when life doesn't allow eight hours

• If you know the night will be short, protect the end of it. Going to bed a little earlier beats setting the alarm earlier to train.
• Catch up with a few longer nights. Getting to bed earlier for several nights in a row is what has worked best in studies, as long as you fall asleep easily.
• Naps count. A meta-analysis of 22 trials found that napping improves physical performance and reduces fatigue, also after short sleep. Naps of 30 to 60 minutes, with more than an hour between waking and exercise, worked best; all were taken between 12:30 and 4:50 pm, and every participant was a young man. If you struggle to sleep at night, skip the nap.
• After a short night, the hardest session can wait. Not because it is dangerous, but because you will probably get less out of it; an easy ride fits better. This is coaching practice, not something tested.

Your watch knows when you sleep; stages, not so much

In a lab study of 34 young adults comparing seven consumer devices with polysomnography, watches, bands and bedside sensors detected sleep well but wakefulness much less well, their sleep stages were inconsistent, and they did worse precisely on bad nights. Sleep doctors have also described patients who seek treatment for sleep problems inferred from their tracker and end up chasing the perfect night. What helps is your weekly trend against your own normal, not the score of a single night.

One clear limit: if you struggle to sleep most nights, snore with pauses or feel sleepy during the day despite sleeping, that is not a habits issue: talk to your doctor. With insomnia, spending more time in bed does not help.

FredCoachBETA

In FredCoach

Every night FredCoach reads the sleep, HRV and resting heart rate your watch or band sends and compares them with your own normal, not with one number for everyone. Sleep is part of your recovery each morning, and the reading of how you are absorbing your week takes into account a run of short nights, so it is not mistaken for training fatigue. When your week has been short on sleep, "What can help" suggests evidence-based habits such as a few longer nights in bed or a regular bedtime. And if you ask the coach why, it tells you what the studies say and how certain they are. Request access at coach.freds.cc (we are in beta).

Request access at coach.freds.cc

FAQ

Does a bad night before a big ride matter?

It is very common: in a survey of 283 elite athletes, nearly two in three had slept worse at least once before an important competition, mostly from thinking about the event and from nerves, and it was a one-off, not a general sleep problem. One short night can cost a little, but whether a single bad night before changes your ride has not been studied.

Can you catch up on lost sleep at the weekend?

Sleeping longer for several nights in a row is what has worked best in studies with athletes. Whether you can bank sleep ahead of a short stretch has not been proven.

Is it better to train early even if I sleep less?

If training means waking earlier than usual, you cut sleep at the end, which is what costs most. If you can, move the session or go to bed earlier.

How long should a nap be to perform better?

In trials, 30 to 60 minute naps improved performance most, with more than an hour between waking and exercise. All were taken between 12:30 and 4:50 pm, and those trials were in young men.

Sources

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