The clothing item typically worn when sleeping is called "pajamas." Pajamas are a type of sleepwear designed to provide comfort and ease during sleep. They usually consist of a soft top and bottom, often made from materials like cotton, flannel, or silk, which are gentle on the skin and allow for breathability. Pajamas can come in various styles, including two-piece sets with button-up tops or pullover shirts paired with pants or shorts. In some cultures, pajamas can also include a nightgown or nightshirt, especially for women. The main purpose of pajamas is to offer warmth and relaxation, helping to ensure a good night’s sleep.