I finally got eight hours of sleep. It took me three days, but whatever.
or
My boss calls me 'the computer', not because of my calculation skills but because I go to sleep when left unattended for 15 minutes.
or
Insomnia is terrible. But on the plus side... Only three more sleeps till Christmas.
or
What do you call it when a kid is fighting going to sleep?
Resisting a rest.
or
How do you confirm that you have insomnia? You know that the farmer has 901 sheep.