Hit the Sack
Hit the sack is an informal expression meaning to go to bed to sleep. Phrase Finder places it in the United States in the early twentieth century; the reviewed evidence in this wave is sufficient for that broad chronology but not for a precise first printed use or a proved single-origin story.
It means to go to bed, usually because you are ready to sleep.
Key details
What the evidence supports
The idiom was in American use by the early twentieth century.
Phrase Finder summarizes the expression as US, early 20th century.
The phrase was coined specifically because early beds were literal sacks filled with material.
The reviewed sources support the meaning and broad chronology but do not establish a single documentary coinage mechanism.
Documented timeline
- Date unresolved
US early-twentieth-century use
Phrase Finder places the idiom in the United States in the early twentieth century.
Variants
Current Cambridge form.
Cambridge lists hit the hay as a synonymous idiom.
Meaning over time
Modern sleep sense
Go to bed in order to sleep.
Further guidance
Contextual Examples
I have an early start, so I’m going to hit the sack.
By eleven, everyone was ready to hit the sack.
Meaning
Cambridge defines hit the sack, also hit the hay, as an informal way to say go to bed in order to sleep.
Meaning Boundary
Keep the sense tied to going to bed; do not treat a plausible “sack as bed” story as proven origin unless separately evidenced.
Origin boundary
this guide does not turn the intuitive “sack as bed” explanation into a proved coinage story because the reviewed source summary does not establish that chain directly.
Practical Use
Use “hit the sack” to say someone is going to bed to sleep.
Regional History
Phrase Finder labels the idiom as US, early twentieth century, while current use is widely understood beyond the United States.
Tone Boundary
Informal. It works naturally in speech and casual writing, not usually in formal notices or medical guidance.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- HIT THE SACK definition (opens in a new tab)Cambridge Dictionary · Current informal meaning
- Hit the sack — idiom summary (opens in a new tab)Phrase Finder · US early-20th-century history summary