Other than caffeine and sugars, are there any foods which might cause a person difficulty getting to sleep, or staying asleep?

as i mentioned in my other post,
and now that i see this one, i strongly suggest you buy that book:
Sleep Thieves: An Eye-Opening Exploration into the Science and Mysteries of Sleep
by
Stanley Coren

you can get it at amazon.com
here:Sleep

its under 10 dollars.
and its a great book, educational, fun and easy to read.
-chris