I take 15-30mgs of Restoril. I get 7-8hrs but recently I've been waking up/staying awake after 4 hours which can be annoying if I don't have to be awake until another 2-3 hours. I always wake up at 5:30, I try to go back to sleep, then wake up again at 6:30. this continues to happen until 8:30 and by then I am completely exhausted from all the interruptions.