@squirrel MY_SLEEP_TOOLS.TXT
For planning when to go to sleep/when to wake up - http://sleepyti.me
For tracking how my sleep is going - https://mysleepbot.com
I also have a friend who helps me get back on the sleep wagon by texting me goodnight when they go to bed (around 23h) which gently prompts me to start thinking about the same.
Good luck!