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This has nothing to do with coffee and much more to do with regular sleep. Neither of which are mutually exclusive.

• staunch 14y ago
  Caffeine can certainly interfere with one's ability to maintain a consistent sleep cycle.
  • enraged_camel 14y ago
    Yep. I used to have very vivid dreams (indicative of light sleep) and wake up often. Ever since I stopped drinking caffeine (coffee, energy drinks, and to a lesser extent, tea), my sleep has been deep and uninterrupted.
  • _delirium 14y ago
    True, and I believe partly because people underestimate some time-related aspects. They seem to vary a lot person to person, but a few bits: 1. Peak blood caffeine levels come about an hour after ingestion, at least for coffee. So a 3pm coffee, for example, is really hitting its peak closer to 4pm. 2. Biological half-life is anywhere from 3 to 6 hours, and that's counting from peak blood levels, so it's more like 4-7 hours considering #1. So if you have two cups of coffee at 3pm, you might still have a cup of coffee's worth of caffeine in the blood stream well into the evening. Much worse if you had 3 or 4 cups in the afternoon. My guess is that there will be less sleep disruption if you stick to no more than 2 cups of coffee, no later than mid-morning, which should give enough time for most of it to be eliminated by evening. But not aware of whether there's good evidence on that.
    • aaronblohowiak 14y ago
      Also some people, such as myself, metabolize caffeine at a slower rate due to genetics. SNP rs762551