everybody is different, but most people cant for example sleep for 3 hrs at 7pm, which is what you would be trying to do if you were heavy on say the early Jo'burg, or at midday on a USA west coast.
I don't know, I'm quite fond of an afternoon snooze - even on a 2 man!
Fruitbat: now I know why I'm not getting any (at home
)