4 ms·

Apparently because it breaks the mental association between being in bed and sleeping, which can exacerbate sleep problems/insomnia and reduce quality of sleep.

• levesque 11y ago
  And what about reading a few minutes to clear your mind of the previous day?
  • wyldfire 11y ago
    IMO unless you have trouble falling asleep, the "bed is for sleep or sex" advice is not as useful as "just make sure you get enough sleep."
    • levesque 11y ago
      I agree, just wanted to see what he would come up with.
• incongruity 11y ago
  That's begging the question (in the original and still proper use =) – the OP's claim has become a bit of a platitude on the internet and yet I've seen scant evidence for it. It may well be there, but, admittedly, as I said above, it doesn't seem to be really all that wise.