Same as me @_@
I can't sleep during the night and go to bed around 5-6 AM, then wake up 2-4 PM if I have free day (if not, well...) My biological clock is completely crazy, dead during the day and full of vitality in the night... the only way to get back on proper cycle is trying to sleep even if you can't or spend more time working or doing something to get tired. Or take prozac... heheheheheheheh ;)