"took my first ambien last night at 10. started with half like my doctor said. took the other half at 1am since first half obviously didn&#039;t work. here i sit at 5:30am and my eyes still haven&#039;t closed. only difference with me is that when i didn&#039;t take i sleep a couple of hours and feel fine. taking ambien i don&#039;t sleep at all but feel tired!"