Caffeine Effects on Sleep Taken 0, 3, or 6 Hours before Going to Bed

What this work gives Aellic

400 mg of caffeine six hours before bedtime costs more than an hour of sleep: “Even at 6 hours, caffeine reduced sleep by more than 1 hour” (n = 12, double-blind, placebo-controlled). Carries the mechanism — but not the dose, since a marker knows only a time of day.

Where this sits in the engine

3 declared sites: constants and thresholds in the code that point at this entry.

• Behaviour Alcohol and caffeine 2 sites
• Behaviour Suggested routines 1 site