I would also think that you're body is still trying to get rid of the sleeping tablets and coffee in your system - so I would do as every one suggests above and see how it goes... give it time though - how long were you on sleeping tablets?

I sleep about 5 hours a night - always I don't need any more, and I rarely sleep solid throughout the night without waking up all - Atkins does help the sleep pattern so please continue and just don't stress it and let your body sort itself out

Sarah