"i&#039;ve taken 12.5 mg ambien cr on an off for 3 months now.  within the last two weeks, it&#039;s been more like every day.  i was so groggy all day. also, i&#039;m not sure i slept... it was more like just being turned off rather than in a state of recuperative sleep.  i cut the pill in half last night and had only 4 hours of sleep, where i awakened twice.  i still feel more refreshed than ever, probably because this is the first time in weeks i don&#039;t have an ambien hangover.  it&#039;s a great medicine, but i&#039;d like to ween myself off of it.  i suspect it&#039;s either causing depression, or is amplifying a depression i didn&#039;t know i had."