How Long Does Caffeine Stay in Your System? (And When to Stop Before Bed)
Caffeine’s half-life is about 5 hours, so half your 3 PM coffee is still in your body at 8 PM. A sleep study found caffeine 6 hours before bed still cut sleep by over an hour.
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What Is the Best Time to Go to Bed? What a Study of 88,000 People Found
In a UK study of 88,026 adults, people who fell asleep between 10 and 11 PM had the lowest rate of heart disease. Here is what that means for your own bedtime.
