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Nightwear, also called "sleepwear", "sleeping suit", "nightclothes", or "nightdress", is clothing designed to be worn while sleeping. The style of nightwear worn may vary with the seasons, with eg. warmer styles being worn in colder conditions. Some styles or materials are selected to be visually appealing or erotic, sometimes in addition to their functional purpose of warmth.

Examples of types of items of nightwear include:

* Babydoll - a short, sometimes sleeveless, loose-fitting nightgown or negligee for women, generally designed to resemble a young girl's nightgown.
* Blanket sleeper - a warm sleeping garment for infants and young children.
* Chemise - when used in reference to sleepwear, it is a delicate, usually provocative, loose-fitting, sleeveless, shirt-like lingerie, similar to babydoll, but tighter at the hips.
* Negligee - loose, sensuous nightwear for women usually made of sheer or semi-translucent fabrics and trimmed with lace or other fine material, and bows.
* Nightgown - loose hanging nightwear for women, typically made from cotton, silk, satin, or nylon.
* Nightshirt - loose-fitting garment, longer than a regular shirt.
* Nightcap - a warm cloth cap sometimes worn by women or men with pajamas or a nightgown.
* Peignoir - a long outer garment for women usually sheer and made of chiffon. They are usually sold with a matching nightgown, negligee or panties but are often worn with no underwear.
* Pajamas - loose fitting two-piece garments for women, men and children. They may be made from cotton, silk, satin or synthetic materials.