As poppyale indicated, it could be hydro or darvocet. I haven't had the sweating problems with hyrdo. But, I do remember being prescribed darvocet; and it was horrible the way it reacted in my system. I had the sweating like you mentioned, but it wasn't restricted to just night time. I've known others who had the same sweating/hot flash type reaction to darvocet. I hope your doctor is able to help you because that is one irritating way to sleep through a night.