#8
Limiting Caffeine After 2 PM
Limiting Caffeine After 2 PM is a simple but high-impact habit backed by pharmacokinetics: caffeine’s 5-6 hour half-life means a 3 PM coffee retains half its stimulant effect at 9 PM, delaying sleep onset by an average of 45 minutes. Cutting caffeine early costs nothing and reduces night wakings by 20%.
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