True for me. I often get really sleepy around 9-10 PM. When I force myself to go to bed right then, when my eyelids are heavy, I usually sleep through the night (with perhaps a 15-minute semi-awake period in the middle) and wake around dawn feeling well-rested. But if I shrug off my drowsiness, I usually get a second wind around 11 that will keep me going until at least 1 AM, and then the next day I don't feel rested at all.