Here I should mention what's almost elementary if you think about it. On monophasic days, normal or in-betwee biphasic days, when I get home, I get progressively more tired. Even if I use the hours till midnight then sleep, I do that in spite of the tiredness. On biphasic days, I do get sleepy around nap time, but only very close to the nap time. Then after nap to core is a fresh day with full energy usually, and I get sleepy close to the core start time.
Tonight I felt that progressively tired feeling. So much so that I decided to call it a day around 2230.
Morning 25th: Went to bed at 2230 with an alarm set for 0600. The idea was to get 7.5 hours of sleep to be ready for a long, nap-less day ahead. But I knew I wouldn't sleep that long even without the alarm.
What I wasn't ready for, was to wake up at 0200. I was not only awake but felt like I could get up and start the day. Of course, I didn't. Starting a day that early would have meant disaster in the evening.
Then I woke up at 0313. Then again about 0408. Each time I felt the same, that I had had a good night's sleep.
Finally I did wake up at 0500. Yes, an hour before the alarm time.
I think my sleep cycle has shrunk from the 90 minute to somewhere around 60 minutes. Also, the REM content in each sleep cycle is more. Even at 2 am after 3.5 hours of sleep I felt great, well-relaxed and ready to handle a day. And at 5 am I felt like I could wrestle a lion, maybe even 2 if they were on monophasic sleep schedule!
Energy levels: 100%
Mood: Weekend-Creative (relaxed, not hassled, ready to do some creative things).
I did have light tea in breakfast but only to avoid warm milk, I didn't need tea or anything, I was fully awake.