Live Healthy Over 50 Daily · Thursday, October 22, 2026
Ever lie awake at 2 a.m. after what felt like a perfectly innocent afternoon coffee? Timing may be the missing piece.
What it may do for you
Caffeine reaches its peak level in your blood within about an hour, and you may keep feeling it for four to six hours, says MedlinePlus from the National Library of Medicine. Think of it as a dinner guest who stays long after dessert. A 3 p.m. cup can still be in the room at bedtime.
In a small study of 12 healthy adults in the Journal of Clinical Sleep Medicine (2013), 400 mg of caffeine cut sleep by more than an hour, even when it was taken 6 hours before bed. The FDA says 400 mg is about two to three 12-ounce cups of coffee, and that people vary widely in how sensitive they are.
Age may add to it. The Tufts Health & Nutrition Letter reports that some research suggests older adults may be more prone to the effects of daytime caffeine on sleep. For people who have trouble sleeping, its expert advises no caffeine after lunchtime.
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Try this today
Pick a caffeine cut-off, such as lunchtime. For the next week, swap your afternoon cup for decaf, herbal tea or water, and notice how you sleep.
Good to know
Caffeine affects people differently, and the FDA says medications and medical conditions can change how much is too much for you. If you take medicine or have ongoing sleep trouble, ask your doctor or pharmacist.
To your health,
The Live Healthy Over 50 Team
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For general education only. Not medical advice. Talk with your doctor before changing your diet, especially if you take medication or manage a health condition.