How do you say “Hit the sack” in German?

Both "hit the sack" and "sich aufs Ohr hauen" are colloquial idioms that signify going to bed or lying down for sleep. While the English expression historically references sleeping on a sack filled with straw or feathers, the German expression relies on the bodily imagery of resting one's head down sideways on a pillow, directly onto the ear. Both convey a sense of weariness and a casual intent to turn in for the night.

In terms of register, "sich aufs Ohr hauen" mirrors "hit the sack" almost identically: it is appropriate among friends, family, and informal workplace settings, but would sound out of place in a formal context. German speakers also frequently use "sich in die Falle hauen" (literally, to throw oneself into the trap), which shares the exact same violent verb *hauen* ("to hit/smack") and colloquial flavor.