i can deal with 3pm appointments   for me its when i know i have to wake up early if i have to be up before 7am for some reason i better fall asleep before 1am or im not sleeping the worry about whether or not any of my 10 alarms will be able to wake me up if i fall asleep keeps me up all night  however if i take some ritalin when that worry happens i can fall asleep simulants = sleeping pills go figure