Hi im 18 and ive been having sleeping problems lately. i go days without sleeping. Well about 30 minutes ago i took an ambien cr pill. Ive never take any pill before now because im paranoid of my mental state being altered, and so far other than a half hour panic attack and a slight head ache i feel nothing? How is it exactly this pill is suppose to make me sleep? And how long does it take to work? Also, what signs can i expect to let me know its working?