[alfiedotwtf]

Reading one of William Dement's books on sleep, 20 minutes to fall asleep should be the amount of time to try (otherwise get up and do something else until you're actually tired, because there's no point in wasting 2 hours in bed awake).

Interesting on the dementia and sleep... though all my grandparents lived to old age, and my dad who I know hardly sleeps is in his 80s and doesn't really have memory issues. Hopefully that keeps up!

But thanks - I'll keep an eye on that one