There’s an extra problem I run with drastic sleep cycle changes. Say I’m sleeping from 3 AM to noon. Then I do the cold turkey wake up at 6 AM, so far so good. Next evening I go to bed at 21:30, then my brain apparently goes, “hey, it’s a lot earlier than usual, must be an afternoon nap”, and helpfully wakes me up sometimes at 1 AM. (Other people’s brains might not have this feature.) This tends to lead to having to go multiple consecutive days with little sleep if I want to change the cycle, instead of just the one, which gets considerably less fun. The fix to this might be to do something on the cold turkey day that gets me sufficiently tired that I’d just sleep 9 hours straight on the next night, whatever the bedtime.
The cold shower thing is still working, so far I’ve had only one night when I’ve failed to fall asleep after taking the shower.
There’s an extra problem I run with drastic sleep cycle changes. Say I’m sleeping from 3 AM to noon. Then I do the cold turkey wake up at 6 AM, so far so good. Next evening I go to bed at 21:30, then my brain apparently goes, “hey, it’s a lot earlier than usual, must be an afternoon nap”, and helpfully wakes me up sometimes at 1 AM. (Other people’s brains might not have this feature.) This tends to lead to having to go multiple consecutive days with little sleep if I want to change the cycle, instead of just the one, which gets considerably less fun. The fix to this might be to do something on the cold turkey day that gets me sufficiently tired that I’d just sleep 9 hours straight on the next night, whatever the bedtime.
The cold shower thing is still working, so far I’ve had only one night when I’ve failed to fall asleep after taking the shower.