How many times have you said it over the years? Long day at work, kids finally asleep, and someone announces, “I’m going to hit the sack.” It rolls right off the tongue. But have you ever stopped to wonder where in the world that phrase actually came from?
It turns out the answer is surprisingly literal. And it goes back a lot further than most people realize.
The Sack Was the Bed
For most of human history, people did not sleep on anything resembling a modern mattress. Instead, they stuffed hay, straw, or grass into a large cloth sack and slept on that. This practice dates all the way back to ancient Egypt and kept right on going through the 1800s.
So when someone said they were hitting the sack, they meant exactly that. They were flopping down onto a lumpy bag of straw. Not exactly a pillow-top king, but it got the job done.
By 1825, sailors had already turned the word “sack” into everyday slang for bed. They even used phrases like “sack duty” to mean getting some sleep. Sailors have always had a way with words.
“Hit the Hay” Came First
You have probably also heard “hit the hay”; and that one is actually older. According to the Oxford English Dictionary, “hit the hay” showed up in everyday speech in the early 1900s, well before its cousin phrase caught on.
“Hit the sack” came into its own in the 1940s. American soldiers during World War II were using military slang for a sleeping bag, and the expression carried over into everyday conversation about going to bed.
One of the earliest written examples comes from a 1944 war journal kept by U.S. Navy sailor Thomas D. Schreck. He wrote simply: “Got the ship slowed down because of a sub warning. Hit the sack at 21:00.” There it is, plain as day, right in the middle of wartime.
Why It Still Feels Right Today
Nobody sleeps on a hay-stuffed sack anymore, but the phrase has never gone away. There is something about it that feels just right. It is casual and comfortable in a way that fancier expressions never quite manage.
Compare it to “retire for the evening” or “turn in for the night.” Those sound like something out of a period drama. “Hit the sack” sounds like a real person who has had a long day and is done with it.
Some language experts point out that the phrase carries a little extra weight, too. Saying you are going to hit the sack suggests you are genuinely exhausted, so tired you could sleep on a bag of straw if you had to. The old meaning still echoes through the modern one, even if nobody has seen an actual hay sack in generations.
So the next time you announce you’re hitting the sack tonight, you are carrying on a tradition that runs from ancient Egypt through the decks of Navy ships in World War II, all the way to your living room couch. Not bad for three little words.