insomnia
"While Rozerem is effective for getting and staying asleep, I am spaced out the next day with a strange feeling that, even though my body has had a good night rest, I still want to go take a nap at periods through the day - not a normal tiredness, but a drug induced grogginess that comes on suddenly.  Also, hard to focus my attention the next day.  I went on this because Ambien gave me short term memory loss though I had no grogginess the next day on Ambien.  The best result for me is to just sleep naturally with whatever hours I can get."