Sleep

Sleep - The most underrated training variable

Definition

Sleep is a recurring physiological state where the body and brain perform essential recovery, regeneration, and consolidation functions. For an athlete, it's the most important variable after training and nutrition.

Without quality sleep, no training and no diet will deliver their full potential. It's the silent multiplier of every result.

💡 Sleep deprivation impairs strength, coordination, focus, and immune function. Two nights of 4 hours = same cognitive impairment as 0.10% blood alcohol.

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Why sleep is critical for a lifter

Concrete physiological benefits:

• Growth hormone (GH) secretion: ~70% happens during deep sleep
• Muscle protein synthesis: peak during slow-wave sleep
• Cortisol regulation: stress hormone drops at night
• Tissue recovery: muscle, tendon, joint repair
• Glycogen replenishment: fuel for the next session
• Memory consolidation: motor learning of techniques

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The sleep cycle

One full sleep cycle lasts ~90 minutes and goes through 4 phases:

Phase	Duration	Role
N1 (light)	5-10 min	Falling asleep, transition
N2 (light)	10-25 min	Light sleep, slowdown
N3 (deep)	20-40 min	Deep sleep, GH, repair
REM (paradoxical)	10-30 min	Dreams, memory consolidation

An adult goes through 4-6 cycles per night. The first cycles are richer in deep sleep, the last ones richer in REM.

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Effects of sleep deprivation

Studies on athletes are clear:

Effect	Magnitude (vs 8h sleep)
Strength loss	-5 to -15%
Aerobic capacity drop	-10 to -20%
Reaction time	-30%
Testosterone (men)	-10 to -15%
Cortisol	+30 to +50%
Increased injury risk	+70%
Hunger / cravings	+15 to +25%

⚠️ Studies (Walker, Stanford) show that elite athletes sleeping < 7h have a 1.7x higher injury risk than those sleeping 8+ hours.

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How much sleep do you really need?

Recommendations by profile:

Profile	Recommended sleep
Sedentary adult	7-9 hours
Recreational lifter	7-9 hours
Serious athlete	8-10 hours
Elite athlete	9-10 hours + naps

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How to improve your sleep

Sleep hygiene (the basics)

• ✅ Consistent schedule: bed and wake-up at the same times, including weekends
• ✅ Dark, cool bedroom (16-19°C / 60-67°F)
• ✅ No screens 1h before bed (or blue light blockers)
• ✅ Daylight exposure in the morning: regulates circadian rhythm
• ✅ Last meal 2-3h before bed: better digestion = better sleep

Things to avoid

• ❌ Late caffeine: half-life of 5-6h, no coffee after 2pm
• ❌ Late alcohol: makes you fall asleep but ruins REM sleep
• ❌ Late training (within 2-3h of bed) for sensitive sleepers
• ❌ Blue screens in bed: melatonin suppression
• ❌ Heavy meals before bed: poor digestion = restless sleep

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Naps - useful or not?

The science is clear: a well-managed nap is a real performance ally.

• ✅ Power nap (10-20 min): improves alertness, no inertia
• ✅ Long nap (60-90 min): full cycle, real recovery
• ⚠️ Mid-length nap (30-50 min): wakes you up in deep sleep, post-sleep grogginess
• ⚠️ Late nap (after 4pm): can disrupt night sleep

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Sleep and supplementation

Some supplements with proven evidence:

• Magnesium (200-400 mg): muscle relaxation, sleep quality
• Glycine (3 g): improves slow-wave sleep
• L-theanine (200 mg): relaxes without sedating
• Melatonin (0.3-3 mg): for jet lag, occasionally
• ⚠️ Sleeping pills: avoid without medical advice (dependence, altered architecture)

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Common mistakes

• ❌ Thinking 6h is enough "because that's how it's always been"
• ❌ Trying to "catch up" on missed sleep on the weekend (only partial)
• ❌ Underestimating the impact of sleep on training
• ❌ Drinking coffee non-stop to fight fatigue
• ❌ Comparing yourself to short sleepers (genuine genetic short sleepers are < 1% of the population)

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Key takeaways

Sleep is your strongest natural anabolic. 8-9 hours per night, regular schedule, optimized sleep hygiene. Sacrifice your sleep, and your gains will sacrifice themselves with it. You don't build muscle in the gym, you build it in bed.