Last time I was in the (psych) hospital, I was chatting during a break period with a nurse who has an interest in sleep studies. She said they have discovered that caffeine has a rebound effect after 8 hours. So if you drink something caffeinated at 8 p.m., you will be up at 4 a.m. I tried it because I was skeptical, and darned if she wasn't right! She told me not to drink anything caffeinated after 12 noon. I never manage that, but I do cut it off around 4 or 5 pm. It seems to help.

Candy