"i have had insomnia, sometimes quite severe (couldn&#039;t sleep for 3-4 days, which is severe) and had been successfully taking 10mg of ambien for the past 5 years, along with melatonin 5mg. then it stopped working. i&#039;d wake up after 2 hours of non-restful sleep. 
  my dr and i decided taking a vacation from ambien might be helpful. i had tried lunesta first, before ambien, years ago...and dreaded the awful taste. 
   but hey, i have to sleep. 
   the first weeks surprised me. i didn&#039;t get dazed or feel weird before falling asleep, like with ambien. i just slept 
   the downside is i wake achy and stay groggy, sleeping longer than i planned...so it is hard to get &quot;up and at it.&quot; 
    i&#039;ll take the sleep, though. adding melatonin help"