I found that since starting Atkins my body wakes me up on its own. It seems I can't go past about 8 hours now if I wanted to.
I used to sleep as much as I could, at least 10 hours, and still wake up feeling tired and groggy. Now wether its naturally or the alarm, when my eyes pop open I am sooooo awake!
I also sleep way better. I don't have as much of a problem falling asleep and then I sleep through the night, deeply and wake up feeling like I actually got a good night's sleep.