Take a nap

This task shows up more often when you're in a lot of pain or if you are low on spoons, stamina, or energy reserves.
Go to your bedroom.
Take off your clothes.
Fold them and put them on the chair.
Put your pyjamas on.
Set an alarm for an hour or two from now.
Lie down under the covers.
If you can't sleep, try practicing your multiplication tables in hexadecimal; it's less boring than counting sheep.