The Vitruvian Protocol

System IV of XI

Nervous

Brain, cord & nerves

Why it matters

Sleep is when the brain consolidates memory, recalibrates mood and emotion, and clears metabolic waste. Short or irregular sleep impairs attention and judgment within a single night. Over years it is associated with depression, cardiometabolic disease and cognitive decline.

The protocol

Protocol 1

Sleep 7–9 hours, on a regular schedule

Grade A · Strong evidence
How to do it
  • Fix your wake time, including weekends, and count back 7.5–9 hours to set a bedtime.
  • Get outdoor daylight within an hour of waking. Keep the bedroom dark, cool and quiet.
  • Stop caffeine at least 6 hours before bed. A dose even 6 hours before bed measurably shortens sleep.
  • If you snore loudly, gasp at night or are sleepy by day, get assessed for sleep apnea.
  • For persistent insomnia, cognitive behavioral therapy for insomnia (CBT-I) is the recommended first-line treatment, ahead of sleeping pills.
Why it works
During sleep, memories are replayed and consolidated. In animal studies, the space between brain cells widens during sleep, speeding the clearance of waste such as β-amyloid.
The evidence
A joint consensus of the American Academy of Sleep Medicine and Sleep Research Society reviewed the evidence and concluded that adults should sleep 7 or more hours a night regularly for optimal health1. A controlled trial found that 400 mg of caffeine taken 6 hours before bed reduced total sleep by more than an hour2. The waste-clearance mechanism comes from mouse studies and is still being confirmed in humans3.

What to measure

  • Average sleep duration7–9 hUse a sleep diary or wearable for two weeks. Time in bed overstates actual sleep.
  • Wake-time consistency± 30 minRegularity predicts health outcomes independently of duration.
  • Epworth Sleepiness Scale≤ 10A free 8-question score. Above 10 suggests excessive daytime sleepiness worth investigating.

Avoid

  • Alcohol as a sleep aid. It shortens time to sleep but fragments the second half of the night.
  • Untreated hearing loss, smoking, physical inactivity and high LDL cholesterol. These are among the 14 modifiable risk factors that together account for about 45% of dementia cases4.
  • Head impacts without protection. Wear a helmet for cycling, skiing and contact sports.

Sources

  1. Watson NF, Badr MS, Belenky G, et al. Recommended amount of sleep for a healthy adult: a joint consensus statement of the American Academy of Sleep Medicine and Sleep Research Society. Sleep. 2015;38(6):843–844. doi.org/10.5665/sleep.4716
  2. Drake C, Roehrs T, Shambroom J, Roth T. Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed. J Clin Sleep Med. 2013;9(11):1195–1200. doi.org/10.5664/jcsm.3170
  3. Xie L, Kang H, Xu Q, et al. Sleep drives metabolite clearance from the adult brain. Science. 2013;342(6156):373–377. doi.org/10.1126/science.1241224
  4. Livingston G, Huntley J, Liu KY, et al. Dementia prevention, intervention, and care: 2024 report of the Lancet standing Commission. Lancet. 2024;404(10452):572–628. doi.org/10.1016/S0140-6736(24)01296-0

Educational content, not medical advice. These protocols summarize published evidence for healthy adults; they are not a substitute for care from a clinician who knows your history. Check with one before starting a new exercise program, changing medication, or if you are pregnant or managing a medical condition.