If I were you, I would take the following steps:
- Check the lights as suggested by Dan. You can search for posts on this site for issues people have had to see if you are experiencing the same thing.
- Check the hinge area as that has also caused some people problems.
- Check the seams in the roof above your bunk and reseal as necessary.
- Look at the seals around your bunk and check their integrity. It might help for you to read through this thread regarding the Forest River HTT Bunkend Field Fix Kit.
Best of luck and post your progress.