Caffeine evidence, 2013
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Drake C, Roehrs T, Shambroom J, Roth T, Journal of Clinical Sleep Medicine, 2013 — RCT of caffeine timing before bed
- Grade
- Design
- crossover rct
- Year
- 2013
- Participants
- 12
- Ingredient
- Caffeine
- Goal
- Sleep
Effect
400 mg caffeine taken even 6 hours before bed cut measured sleep by over an hour — the basis for our 8–10 hour cutoff guidance.
Limitations and notes
Cited as caution evidence for timing, not as a sleep aid.