Sleep is the most powerful anti-inflammatory, insulin-sensitizing, cognitively restorative intervention available. It is also the one most people negotiate away first. A single night of 4–5 hours of sleep measurably decreases insulin sensitivity the next day; weeks of it decreases lifespan.
The four dimensions of sleep
- Duration: 7–9 hours in the sleep opportunity window
- Depth: adequate slow-wave and REM sleep
- Timing: consistent bed and wake times (± 30 min)
- Continuity: minimal fragmentation and nighttime awakenings
The levers that consistently work
- Bright light exposure within the first hour after waking
- Reducing artificial light and screens in the last hour before bed
- Cool sleeping environment (65–68°F is a common sweet spot)
- No caffeine after noon (half-life of ~6 hours)
- No alcohol within 3 hours of bed
- Consistent wake time, even on weekends
- Daily physical activity, especially resistance training
“The single most effective thing I ever did for my clients was raise the sleep standard. Every other intervention works better on top of a real 7.5 hours.”
“I've watched clients solve their fatigue, weight loss stall, mood, and libido all at once — just by fixing their sleep. If sleep is not in a real place, every other conversation is uphill.”
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Apply this
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Everything on this page is general education. The real leverage comes from applying it to your history, goals, and lifestyle. Start with our Health Assessment.