I done fell asleep fucking last night
That’s how much I don’t sleep nigga

from Big Sean (Ft. Jeezy, Lawrence Lamont & Payroll) – It's Time Lyrics on Rap Genius

Meaning

Because sex is so action-filled and strenuous, its almost impossible to fall asleep during it. But somehow, probably because Sean is always working and gets no sleep, he fell asleep fucking.

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