Nightwear – also called sleepwear, nightclothes, or nightdress – is clothing designed to be worn while sleeping. The style of nightwear worn may vary with the seasons, with warmer styles being worn in colder conditions and vice versa. Some styles or materials are selected to be visually appealing or erotic in addition to their functional purposes.

Nachtwäsche ist der Sammelbegriff für vorwiegend oder ausschließlich Nachts zum Schlafen getragene Kleidung oder Wäsche.