Why worry about it? If I'm awake, I'm awake, if I'm drowsing off, I'm drowing off, if I'm asleep, I'm asleep. Nothing wrong with any of those states. I suppose the worry is that think we we need the sleep and that if we don't go to sleep it'll screw us up.

I think there are situatins like that, where people just can't go to sleep at all - but dropping off and waking up a few times in the night is a pretty normal thing to do, especialy as we grow a bit older. I think our bodies can generally take care of that stuff, and that we get as much sleep as we need.

Of course it helps when we can lie in in the morning and don't have to leap out of bed and belt off to work...