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Recovery
Systematic review
Why sleep matters for your workouts
Reviewed by Joseph Korban, Certified Personal Trainer & Rehabilitation Specialist · Last reviewed 27 September 2026
Losing sleep lowers exercise performance by an average of 7.56% (95% CI -11.9 to -3.13) across 69 publications and every exercise type studied. The effect was consistent after full sleep deprivation and after waking early (late restriction), but not after going to bed late. Most participants in these studies (89%) were men.
What to know
- Treat sleep as part of the training plan, not a bonus.
- After a short night, expect lower performance and lower the intensity rather than pushing through.
- If sleep loss is unavoidable, train in the morning; the drop was larger in the evening.
Evidence
- Craven J, McCartney D, Desbrow B, Sabapathy S, Bellinger P, Roberts L, Irwin C. Effects of acute sleep loss on physical performance: a systematic and meta-analytical review. Sports Med. 2022.