conk out 

when a person has no energy left and falls asleep.

turn the lift off im gonna conk out

conk out by devine August 19, 2003

Conk Out 

British slang. Meaning

1)To suddenly stop working.

2)To suddenly lose consciousness/fall asleep

My SatNav just conked out!
Don't let her mix weed and booze or she'll throw up then conk out in the middle of the lounge
I was halfway through my twelfth Jaeger Bomb when I conked out

Conk Out by GManIOM February 12, 2018