insomnia
"Began taking Zolpidem due to insomnia.  I had no trouble falling asleep but I would not stay asleep and wake up 5-10 times a night.  Now I fall asleep and sleep well for an average of 5 hours. Usually by 3:30am I am awake and not able to fall back to sleep.  I get up for work at 4:30 am.  So at least I am getting 5 good hours but I wish it would last longer.  I long for 7-8 hours of sleep.  I have had no adverse effects.  Don't wake up groggy and no memory loss.  "