I sometimes read about people being able to WILD in the beginning of the night. How is this possible? I don't think it is physically possible, because one enters REM sleep after a couple of hours. So what is going on?

Every WILD I have had in my life was after sleeping for a few hours, waking up, and then going back to bed.

So how can someone WILD right at the beginning of the night, when there is no REM sleep?

Jakob