Did you know that a bed we know all too well is more than 5000 years old? Or may be that your mattress could be home to 10 million dust mites? One thing is for certain. Our mattress facts will tickle your curiosity. Here are some amazing facts about mattresses you didn’t know about.

Mattresses probably don’t seem that interesting to the average person. But we know differently. In our world, mattresses are kind of awesome. Here, 10 fun facts about mattresses that will make you embrace your inner mattress geek.

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10. The word mattress is an Arabic word meaning “throw”

Back in the day (we’re talking like the Crusades), bedding was awful — it consisted of a bunch of straw tied together with coarse binding. It wasn’t until the Crusaders went to the middle east that they discovered the joy of a comfortable mattress. The Arab world had already been sleeping on cushions. Their word for this cushion? Matrah, which came from the word taraha, which literally translates to “throw.”

9. The water bed is more than 5000 years old and used to be made of goat skins

No, the water bed wasn’t invented in the 1970s by swingers wearing polyester shirts (sorry to break it to you). In actuality, the water bed was invented in 3600 BCE by the Persians. They used goatskins filled with water to create a mattress for royalty to sleep on.

8. The first coil springs were used for chairs

The first steel coil springs were invented for chair seats in 1857, but it wasn’t used in bed design until 1865, which was probably the second most impactful event of 1865 (the first being the end of the civil war). However, it wouldn’t be until the 1930s that innerspring mattresses would become popular.

7. A mattress has between 100,000 and 10 million dust mites in it

A typical mattress can have up to 10 million dust mites in it (gross, right?). This often happens because traditional innerspring mattresses have a lot of space for these microscopic critters to roam and reproduce. These little guys aren’t really a problem, unless you have allergies — then they become a very large problem. Luckily, a Nectar mattress — with its 4-layer memory foam construction — is designed to keep dust mites out.

6. Mattresses can double in weight over 10 years

Mattresses can sometimes double their own weight over the course of ten years. That’s because they acquire a buildup of dust mites, sweat, and dead skin cells. So that’s why you need four people to help you flip it over!

5. Mattresses can withstand open flames for at least 30 seconds

Because of US Federal Law, all mattresses sold in the U.S. must be able to withstand an open flame for at least 30 seconds before catching fire. This is because mattresses used to be made of combustible material. Please don’t test this on your own mattress!

4. It’s illegal to purchase a mattress on Sundays in Washington

For some reason, the state of Washington has made it illegal to buy a mattress on Sundays. It’s not totally clear why this law exists or how strictly it’s enforced. But don’t take any chances: Order your bed from Nectar along with our cool adjustable beds on Sunday (or any day), and you won’t need to side-step the law.

3. The fitted sheet was invented in 1958

Why are we putting a fact about fitted sheets on this list? Because the fitted sheet is perhaps the best thing to happen to a mattress (and the worst thing to happen to laundry folders everywhere). Invented in 1958 by a woman named Berta Berman, mattresses would never be the same again.

2. The phrase “sleep tight” comes from the fact that mattresses used to rest on ropes

Mattresses used to have ropes tied around them to keep the bed from sagging. So, “sleep tight,” actually meant tightening the ropes. Who knew this cute goodnight phrase was actually a functional reminder for better sleep?

1. Your mattress can be recycled

Most people just junk their old mattress, but that’s pretty terrible for the environment. There are actually several ways you can recycle your old mattress when you get a new one (read this story for recycling tips!) Places like The Salvation Army will often accept donations. And with Nectar’s White Glove Service, we’ll not only drop off your new bed, we’ll also take your old one and recycle it for you. Now you’re an eco-conscious mattress savant.