My brother and me had an argument today. He's in college, and studying human physiology. He told me that when you sleep that your REM states are shorter as the night proceeds. He agreed that it does get easier to get to REM sleep as the night goes on, but he is SURE that REM does get shorter. I thought I read that in the beginning of the night, REM cycles last up to ten to fifteen minutes, and early in the morning, they last up to 40. I thought that was the reason it was easier to do WILDS and FILDS and such at three AM instead of when you first go to sleep. Any help? Oh, and could you post where you got your findings. He probably won't just accept someone’s word, but if there is an official source, that would sure help. Thanks! ^_^