When i have something like that, i just make an effort and skip a night of sleep.
Then i go to bed at the regular time and sleep comes naturally.
But if you can┤t sleep for 4 days, then that's really serious.
Have you tried some yoga and maybe a joint before going to bed?
Lyoto Machida, former UFC LHW hamp
Future UFC MW Champ
Benavidez, Barao, Aldo, Nate, Nick, Lyoto, TBD, JDS
Forever hanging in Anderson Silva nuts