No surprises since it's my 15th LD in a row! I have learned a few things that may help you if you are just starting with game jams:

• Sleep well! The more you sleep, the better game you make!

• Don't be stressed too much because of the theme. It's quite likely you won't like it ;) But the theme is not the most important thing. If you lack inspiration, just make a game you'd like to make, and the theme will always somehow blend in. Also, the theme constraint often forces you to make something you wouldn't make otherwise, which is often a good thing!

• And most importantly, have fun! At the end of the day, the jam is all about you having fun :)

  Good luck!