This post is based on the fact that dream time coincides with real time - I'm pretty sure that's true based on what I've read.

I've seen on a lot of sleep-brain-wave charts that there are several periods of REM interrupted by periods of NREM. So, is it at all possible for the brain, once it has entered REM, to stay in REM for the entire sleep period? Has anyone ever had a lucid dream that went for the full approximately 8 hours of sleep time? Did it feel like 8 hours?

Just curious That'd be cool if it ever happened.