hit_the_sack
1. [ verb ] go to bed in order to sleep
Synonyms: go_to_bed go_to_sleep get_into_bed retire hit_the_hay kip_down sack_out crawl_in bed turn_in
Examples:

"I usually turn in at midnight" "He turns out at the crack of dawn"

Related terms: get_up get_up bed_down
Similar spelling:   hit_the_jackpot