Have you ever wondered what it actually means? A Google research reveals that it comes most probably from the Hindi word pajāmā or from the Persian paejamah and means leg garment or loosely fitting trousers. In Europe, pyjamas are clothes for wearing to bed and sleeping in. The word is always written in plural: it is a so-called plurale tantum (so not pyjama as it is in German). In the US, you might also see pajamas, whereas people in Australia, the UK or Canada use pyjamas. Having settled all that, we hope that you will sleep well tonight, whether in your pyjamas or pajamas.