I brought out the winter bedding today and happily discovered that my new cotton sheet has phone pockets on both sides!

I've never seen such a marvel before. I'm not an advocate for playing with gadgets during the night, and my phone goes on silent at 9.30pm, but there are odd occasions when it's handy to access during the wee hours.

I bought the sheets on Amazon (no longer available) and the description read: "100% Cotton Flannel Sheets Queen Size - Super Soft, Heavyweight, Double Brushed, Anti-Pill Flannel Queen Sheets - 16" Deep Pocket Queen Fitted Sheet X2 Side Pockets (Queen, Navy Checks)."

I'm hoping the combination will keep me warm during the cold Ballarat nights that are just beginning to consistently be low single figures.

In fact, May has been very mild, with mostly above-average daytime temperatures for several weeks now.

Having survived my first Ballarat winter last year, I'm confident these sheets and a thick winter doona will keep me toasty.

Speaking of sheets, the Amazon supplier runs an international store, and I was pleased to not have any issues with the fit.

It made me wonder if sheet sizes are universal, and apparently they're not. AI tells me:

Even if two countries use the exact same name for a size—like "King" or "Queen"—the actual physical measurements of the mattresses and sheets can be completely different. This comes down to a mix of regional manufacturing traditions, the historical use of imperial versus metric systems, and simple local preferences for how much bed space people want.

The differences generally fall into a few major regional categories:

1. Australia vs. The United States

If you buy a sheet set from an American retailer, it will likely struggle to fit a standard Australian bed.

• The King Size Trap: An Australian King mattress is generally 183 cm x 203 cm. A standard US King is wider and shorter at roughly 193 cm x 203 cm. If you put a US King fitted sheet on an Aussie bed, it will have baggy, loose fabric on the sides.

• The California King: The US has unique sizes like the "California King" (183 cm x 213 cm), which is narrower and longer than a standard US King, designed specifically for taller people.

2. The UK and Europe

Europe relies entirely on the metric system, but even within Europe, standards diverge between the UK and the continent.

• The UK "King" vs. Euro "King": A British King size bed is 150 cm x 200 cm. In mainland Europe, a standard double/king setup often leans toward 160 cm x 200 cm or even two single mattresses pushed together under a single large top sheet.

• Naming Conventions: The US "Twin" is called a "Single" in Australia and the UK, while the US "Full" is generally known as a "Double" elsewhere.

There you go, the store must know which sheets to ship to each market.

I would have been surprised if there was a global standard. We still have different measurement systems and, even in Australia, we can't get trains to run on the same tracks between states.