Sleep & Recovery for Strength Training

How Much Sleep You Need

Adults: 7-9 hours/night (National Sleep Foundation, 2015)

Strength athletes benefit from the upper end of this range due to higher recovery demands.

Hours/Night	Recovery Impact
9+	Optimal for strength trainees
8	Excellent
7	Adequate
6	Detrimental — measurable performance decline
<6	Major performance decline + health risks

What Sleep Does for Strength Training

1. Growth Hormone Release

~70% of daily GH release happens during deep sleep (stages 3-4). GH drives muscle protein synthesis and fat oxidation.

2. Testosterone Production

Testosterone peaks during REM sleep. A 2011 study (Leproult & Van Cauter) showed 1 week of 5-hour nights reduced testosterone by 10-15% in healthy young men.

3. Glycogen Replenishment

Carbs eaten before bed are preferentially shuttled to muscle glycogen stores during sleep.

4. Central Nervous System Recovery

The nervous system fatigues from heavy lifting and requires sleep to reset neural drive and motor coordination.

5. Protein Synthesis

Muscle protein synthesis (MPS) continues throughout sleep, especially with adequate pre-sleep protein (30-40 g casein or whole food).

Performance Impact of Sleep Loss

6 hours for 1 week (Fullagar et al. 2015):

• Reaction time: 20-40% slower
• Maximum strength: 5-10% decline
• Perceived exertion: 15-20% higher
• Focus/motivation: significantly reduced

1 night of 4 hours sleep:

• Glucose metabolism impaired by ~40%
• Cortisol elevated next day
• Recovery from training delayed

Sleep Hygiene Checklist

Pre-sleep (60-90 min before bed):

• ☐ Dim all lights / blue light blockers
• ☐ No screens or screens in night mode
• ☐ Stop caffeine by 2pm (caffeine half-life: 5-6 hours)
• ☐ No intense exercise within 2 hours
• ☐ Cool room (17-20°C / 62-68°F)
• ☐ Consistent bedtime (±30 min)

Bedroom environment:

• ☐ Dark (blackout curtains or eye mask)
• ☐ Quiet (or white noise)
• ☐ Comfortable mattress/pillow
• ☐ No TV in bedroom

Diet:

• ☐ Limit alcohol (disrupts REM)
• ☐ Avoid heavy meals within 2-3 hours
• ☐ Optional: small protein snack (30-40g casein/cottage cheese)
• ☐ Adequate magnesium (400mg) — nuts, seeds, leafy greens

Training Adjustments for Poor Sleep

If you slept <6 hours:

• Reduce working set RPE by 1-2 (stay at RPE 6-7, not 8-9)
• Skip last working set of each exercise
• Consider replacing strength work with mobility/light cardio
• Don't chase PRs

If you've had <7 hours for 3+ nights:

• Schedule a deload week
• Prioritize sleep before volume
• Accept that progress will stall until sleep improves

The Sleep-Training Feedback Loop

Good loop: Train hard → deep sleep → recovery → perform better → repeat Bad loop: Sleep poorly → train poorly → feel bad → sleep worse → repeat

Breaking a bad loop: Prioritize 1 week of 8+ hours sleep even if you have to skip workouts. Training less but sleeping more usually produces better outcomes than training more while sleep-deprived.

Tracking in the App

The Mood & Wellness page tracks:

• Sleep hours (last night)
• Sleep quality (1-5 scale)

This data helps identify patterns over weeks — e.g., "I hit PRs on weeks with 8+ hour average sleep."

Common Misconceptions

❌ "I can catch up on sleep on the weekend" True to some degree but incomplete. Sleep debt accumulates faster than it can be repaid.

❌ "I only need 6 hours, I've always been fine" Research shows subjective adaptation to sleep loss occurs even as performance objectively declines. You think you're fine; you're not.

❌ "Exercise tires you out, helping you sleep" Intense exercise within 2 hours of bed can disrupt sleep onset. Morning/afternoon exercise improves sleep quality.