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.
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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
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