# The effect of caffeine on subsequent sleep: a systematic review and meta-analysis

Gardiner C, Weakley J, Burke LM, et al. · Sleep Medicine Reviews 69:101764 · 2023



## Key finding

Caffeine reduced total sleep by ~45 min and efficiency by 7%. To avoid effects, a coffee (~107 mg) should be ~8.8 h before bed; a pre-workout dose (~217 mg) ~13 h.



[Read the paper](https://pubmed.ncbi.nlm.nih.gov/?term=The+effect+of+caffeine+on+subsequent+sleep:+a+systematic+review+and+meta-analysis)

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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.

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