my mom suggests that I should keep a “feeling” journal separate from the data logging and then do a blind comparison at the end of a week.  (what days do I feel good vs what days does the graph say I slept well.)  Sounds like a good plan once I get over the initial thrill of reading my sleep data every morning.

My first two nights were both approx 40% light sleep, 25% deep sleep, and 35% REM sleep.  Last night I was 50% deep sleep, and 25% REM, 25% light sleep.  (Simply put, deep sleep and REM sleep are the good ones.)  Also, I only slept for 5 hours last night, as opposed to 8 and 7 the first two nights.  So I got about the same amount of deep sleep and a little bit less REM sleep for the same amount of total sleep.  More efficient?

In terms of drivers: I has no coffee yesterday, and a bunch of wine last night.

Interesting.