# Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed

Drake C, Roehrs T, Shambroom J, Roth T · Journal of Clinical Sleep Medicine 9(11):1195–1200 · 2013



## Key finding

400 mg caffeine taken even 6 h before bed cut objective sleep by >1 h — while subjects barely noticed.



[Read the paper](https://pubmed.ncbi.nlm.nih.gov/?term=Caffeine+effects+on+sleep+taken+0,+3,+or+6+hours+before+going+to+bed)

---
Educational summary of published research, not medical advice. Screening scores are not diagnoses. If a score is elevated or you feel unwell, talk to a clinician.

SleepShred for iPhone: https://apps.apple.com/app/id6802040541