"been taking this for years. the only thing that has worked for me. i can stay up all night without it. i have learned you have to go to bed hungry, that way it has nothing to compete with in your stomach.  no side affects the next morning. get about 4 to 5 hrs now which is good for me. now if my insurance would pay for this! just got new insurance this year and they consider this a tier 4 medication. don&#039;t know which is worse. going broke or not getting any sleep."