I woke at 6 AM today without the alarm. Usually I get up at 7:30. This makes it 6 and a half hours of sleep instead of the usual 8 hours.
Falling asleep is no problem for me and I take a half hour nap in the afternoon.
To decide if I should always get up at 6 AM or go back to getting up at 7:30; I checked the web for information.
On the the web I found this table:
Eight hours seems to be a midpoint. Now if I set the alarm to 7 AM I'll get 7 and a half hours of sleep. If I set it at 7:30 I'll get 8 hours.
I'm going to leave the alarm set to 7:30 but if I get up before the alarm I'll stay up. This will make it 8 hours or less sleep.