Sleep & Recovery
Health #3
The Ultimate Recovery Tool

Sleep
is not
lazy.

Sleep is when your brain consolidates memory, your muscles rebuild, your hormones reset, and your immune system recharges. It is the single highest-leverage activity in your health arsenal.

7–9h
Adult requirement
4–6
Sleep cycles / night
90 min
Per cycle
23%
Of life spent sleeping
Architecture

The Sleep Cycle

Wake
Light N1/N2
Deep N3
REM
Light
Deep
REM
Light
REM (longer)
Wake
Light Sleep
Deep Sleep
REM Sleep
Stage 0
Wakefulness

The transition from consciousness to sleep. Heart rate begins to slow. Body temperature drops by 1–2°C to initiate sleep onset.

1–20 min
Stage N1/N2
Light Sleep

Memory consolidation begins. Sleep spindles protect sleep from disturbance. This is the largest proportion of total sleep time.

50–60% of night
Stage N3
Deep Sleep

Physical restoration. Growth hormone is secreted. Immune system rebuilds. The most restorative stage — deprivation causes physical illness fastest.

20–25% early night
REM Sleep
Dream Sleep

Emotional processing, creativity, and learning consolidation. REM cycles lengthen throughout the night — most REM occurs in the final two hours.

20-25% later night
Optimisation

Better Sleep Protocol

Evening Habits

🌅
Consistent sleep time
Your circadian rhythm thrives on consistency. Going to bed and waking at the same time — even weekends — synchronises your biological clock.
📵
Screen-free 60 minutes
Blue light from screens suppresses melatonin production. Dim all lights one hour before bed. The body needs darkness to secrete melatonin.
🌡️
Cool bedroom (18°C)
Sleep onset is triggered by a drop in core body temperature. A cool room accelerates this drop. 16–20°C is the optimal range.
🧘
Wind-down routine
A consistent pre-sleep routine signals the nervous system to begin the transition to sleep. Reading, stretching, or meditation all work.

Daytime Habits

☀️
Morning sunlight exposure
10 minutes of direct sunlight in the first hour after waking resets your circadian clock and dramatically improves sleep onset that night.
☕
Caffeine curfew at noon
Caffeine has a half-life of 5–7 hours. A 3pm coffee means half of it is still active at 10pm. Cut off by noon for best sleep quality.
🏃
Exercise — not too late
Exercise dramatically improves sleep quality, but raises core body temperature. Finish intense exercise at least 3 hours before bed.
🍷
Avoid alcohol as sleep aid
Alcohol sedates but fragments sleep architecture — it suppresses REM sleep and causes waking in the second half of the night.
The Evidence

Why Sleep Wins

🧠
Brain Cleansing

During deep sleep, the glymphatic system flushes metabolic waste from the brain — including beta-amyloid proteins linked to Alzheimer's disease.

💪
Muscle Repair

95% of human growth hormone is secreted during sleep. Training without adequate sleep yields minimal muscle adaptation regardless of nutrition or effort.

❤️
Heart Health

Consistently sleeping under 6 hours increases cardiovascular risk by 48%. Blood pressure resets during sleep — insufficient sleep maintains elevated BP continuously.