I like to set an alarm for 9 hr 30 min before sunrise. This gives me 30 min to get ready for bed, and to go to bed with time for 6 full REM cycles of 1.5hr each

I like to set an alarm for 9 hr 30 min before sunrise. This gives me 30 min to get ready for bed, and to go to bed with time for 6 full REM cycles of 1.5hr each. The rest of the timing (the timing of my rest?) is up to my body and how much sleep it wants. When I do it this way, vs setting alarms, I'm always surprised by the sleep debt I've accrued and am now paying back. Modern (especially urban) society demands a lot more of us than many of our bodies can sustain.