A fork of Rural Dictionary
the inability to sleep on a Sunday night because you were out late the past two nights partying/hanging out and now you have to go to bed much earlier for work/school the next morning
"I only got 4 hours of sleep last night....I went to bed at 11 but Sunday night insomnia kept me awake forever
The inability to fall asleep at a resonable time due to staying up all night Friday and Saturday
Friend: Dude, why are you so tired? You: I got 4 hours of sleep cause of sunday night insomnia.