If you sleep badly the night before a competition, will your performance drop?

Short answer

Not for strength. In experiments that recreated the typical pre-competition night of falling asleep late, strength and power results did not drop. What cut performance was staying up all night (5.25%) and waking earlier than usual (7.39%), while endurance and accuracy skills dropped even after falling asleep late.

If you sleep badly the night before a competition, will your performance drop?
'Bad sleep the night before → ruined performance.' Is that right?
Many people worry that nervous, broken sleep the night before a competition will wreck the next day's performance. We checked how common it is, and split out which kinds of lost sleep actually lower performance.
Bad sleep before a competition is common
2 in 3 people, mostly because they can't fall asleep
Of 283 people, 64.0% slept badly before a big competition at least once in the past 1 year, and a survey of 632 people found 65.8%. 82.1% of the problems were trouble falling asleep, and the top reason was thinking about the competition (83.5%). When 79 people were asked 4 days before and on competition day, their sleep ratings got worse, but how rested they felt after sleep showed no difference.
Sleeping 6 hours or less lowered performance
An average of 7.56%, depending on how sleep was lost
In an analysis that pooled 69 studies with 959 people, sleeping 6 hours or less lowered exercise performance by an average of 7.56%. Split by how sleep was lost, staying up all night lowered it 5.25%, and waking earlier than usual lowered it 7.39%.
But falling asleep late was different
Strength and power results did not drop
Looking only at nights when people fell asleep later, power results fell 0.50% and strength 1.16%, which was not a meaningful difference. A 2024 analysis that pooled 27 studies with 369 people also found that, unlike staying up all night or waking early, only falling asleep late caused no meaningful drop.
Long-lasting exercise and accuracy were different
They dropped even after falling asleep late
Even after falling asleep late, endurance results fell 5.28% and accuracy skills such as serves and shots fell 23.9%. Endurance had only 2 results, and 7 of the 8 skill results were measured in the afternoon. An analysis of all kinds of lost sleep, pooling 31 studies with 478 people, also found that exercise lasting more than 30 minutes dropped more.
Waking early hit afternoon exercise hardest
Morning 2.48%, afternoon 9.67%
After waking earlier than usual, performance fell 2.48% when exercising in the morning and 9.67% in the afternoon. For every 1 hour spent awake, performance dropped about 0.4% more. In a 2026 study, 14 people were woken at 2:30 a.m. after only 4 hours of sleep, and their jump, agility, and endurance at 4 p.m. all dropped.
Summary: falling asleep late kept strength intact
What cut performance was all-nighters and waking early
In experiments, a night with only a later bedtime did not lower strength or power results. What cut performance was staying up all night or waking earlier than usual, and long-lasting exercise and accuracy skills dropped even after falling asleep late. Even if sleep comes late, not moving the wake-up time earlier than usual is enough.