LeBron James has said he sleeps 12 hours a day, and Roger Federer that he doesn't prepare for a tournament without 11–12 hours. Coincidence? No.
What Happens During Sleep?
During the deep stages of sleep, growth hormone is released and muscle tissue is repaired. The REM stage is critical for consolidating motor skills; in other words, the techniques you've learned are reinforced while you sleep.
How Lack of Sleep Affects Performance
- Reaction time increases by 10–15%
- Decision-making quality declines
- Injury risk rises
- Carbohydrate metabolism is disrupted
How Many Hours Are Enough?
8–10 hours a day is recommended for adult athletes. This need may increase during periods of intense training.
Improving Sleep Quality
- Keep your bedtime and wake-up time consistent
- Keep your bedroom dark and cool (18–20°C is ideal)
- Avoid blue light (phone, computer) for 1 hour before bed
- Set your caffeine cut-off time in the afternoon
Napping
On heavy training days, a 20–30-minute nap improves performance, focus and mood.
A Sleep Routine for Athletes
Adopt a "sleep protocol": dim the lights, shower and change for bed, do 10 minutes of stretching or meditation, then close your eyes.
The best performance-enhancing supplement isn't a pill; it's enough good-quality sleep.