insomnia
"I've had horrible insomnia since I was a child. Diagnosed with severe sleep apnea a few years ago.  Ambien is not the holy grail.  You build up a tolerance over the years but 12.5 is as high as most doctors will go ) from 10, 8 years ago).  Pluses for Ambien - it will put you to sleep; no half-life so no grogginess in the morning.  Minuses- it will put you to sleep but generally not keep you asleep.  Thus the waking up wide awake at 3 a.m.  There is now intermezzo - and sublingual 3.5 dose of Ambien meant for  this problem - works for me 50% of the time- otherwise I just stay up.  Another minus - if you take Ambien on a full stomach IT WILL NOT WORK. I generally eat before 5 and allow 5 hours before I take it.  But in all - a savior!"