I am suffering from the same thing. I fall asleep for about 2-3 hours, wake up, doze off for an hour, wake up and the cycle repeats until morning. In fact I can only sleep properly from about 6-7am onwards. I thought it may be a side effect of Paxil but it started when I moved to the city at the beginning of the year before I went on it. I dread bedtime now because I know it's just an unpleasant struggle until morning.