The most interesting pattern I observed in my sleep is the integral patterns associated with it -- it's nearly impossible for me to wake up after less than 3.5

The most interesting pattern I observed in my sleep is the integral patterns associated with it -- it's nearly impossible for me to wake up after less than 3.5 hours of sleep[1], and then after about 4 hours of sleep it becomes difficult again to wake up until after about 7.5 hours, when I usually wake up on my own, and then after around 8 hours of sleep if I oversleep you're probably not seeing me until I've finished a solid 11 hours.[0] It's extraordinarily useful for planning when I am not getting much sleep. If I must be somewhere at X o'clock, and I can't get a full night's sleep for some reason, I make sure I am going to sleep so that my alarm starts going off when I am at around 3.5 hours of sleep or so. I've missed too many meetings and flights trying to get 5 or 6 hours of sleep. And if I've just pulled an all-nighter and need to be somewhere in 2 hours, I don't go to sleep unless I have someone who can literally kick me awake at the appropriate time, 'cuz nothing else is going to get it done. [0] Yes, I've read enough about sleep to know most of the details behind such sleep rhythms. [1] Well, having children does change that a bit, but a beep-beep-beep isn't going to get the job done.