sage,

I'm going back over your tutorials. One issue I have is your comment "We all know our own sleep cycles, given that we live through them every night."

I honestly didn't really know my cycles until this last month. And that's because of sites like this one.

I actually got the advice to use alarms from either here or another similar site to find my cycles. And they really helped. I found out that NREM I have no recalled dreams. I found I have 2 times that I typically wake after NREM and that they vary in the dreams I have.

If I sleep through one I won't remember it. It's like a double matinee.

Without alarms it's hit or miss.