[nostrademons]

I find that I'll often come up to a point of half-consciousness at about 8/9.5/11 hours, but as long as I don't sit up or get out of bed or start checking my e-mail on my phone, it's pretty easy to fall back asleep.

Whether I want to depends on how much mental activity I've been doing; I'm far more likely to think "That was a nice dream, I don't wanna get out of bed yet" if I've got a thorny challenging problem in my head than if I'm like "Gotta get into work and start coding."

[sycren]

I think it also depends how much light you have in the room. I think you would find it easier to sleep longer if the room was still dark after 8 hours.