"due to high anxiety, i would stay awake anywhere between 36-44 hours. after tylenol pm failed miserably, my doctor put me on ambien. not only does it put me to sleep, it also calms the anxiety down very, very well. i will take it, and within 15-20 min be feeling alot better. i have had insomnia for 8 years. after taking it i feel a little funny in the head, and my vision messes up a little, but that&#039;s it. nothing bad at all. if it wasn&#039;t for ambien, i would not know what a good night&#039;s sleep is! i take the 10mg. i highly recommend it."