Half-life is not a vibe. Afternoon caffeine is still in you when you are trying to fall asleep.
Sleep
Strong evidence
Caffeine cutoff (8 hours)
Last coffee eight hours before bed, not “after lunch maybe.”
How to use
Set a hard last-cup time about eight hours before your target sleep. Earlier if you are sensitive.
Details
- Type
- Technique
- How it works
- Lets adenosine signaling recover before lights out.
- Scientific evidence
- Caffeine reliably delays sleep onset and reduces deep sleep in controlled studies.
Editorial rating ★ 4.6
Free, measurable, and ignored.
Reviews
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