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.

Nightwear includes:

Other types of garment are commonly worn for sleeping, but not exclusively so, including t-shirts, tank tops, sweatpants and gym shorts as well as underwear with no outer garment. Also, sleeping without clothing is not uncommon.

According to a 2004 United States survey, 13% of men wear pajamas or nightgowns for sleeping, whereas 31% wear underwear and another 31% sleep nude. Among women, 55% wear pajamas or nightgowns, which were counted under the same option:

A survey by the BBC The Clothes Show Magazine in 1996 revealed the following about sleepwear in the UK

†Most common response in 'Other' from women was outdoor clothes, from men shorts.

Myleene Angela Quinn (née Klass; born 6 April 1978) is an English singer, pianist, media personality and occasional model. She was formerly a member of the defunct British pop band Hear'Say. Her net worth was estimated at £11 million in April 2012.

Klass was born in Gorleston, Norfolk, England to an Anglo-Austrian father and a Filipina mother. She comes from six generations of classical musicians on her father's side: Klass's grandmother was an opera singer and her grandfather left his violin to her, which she went on to play. Klass began to learn the piano and violin from the age of four and then the harp at 12. She took Associated Board of the Royal Schools of Music exams in violin, piano and voice. She received an A grade in A-level music, and became a Norfolk County scholar.

Klass attended St. Mary's Roman Catholic Primary School, then Cliff Park High school in Gorleston, before going to Notre Dame High School, Norwich for a short time.^{[citation needed]} While at school, she spent her Saturdays studying singing at the Junior Department of the Guildhall School of Music and Drama,^{[citation needed]} and later took a musical theatre course at the Royal Academy of Music, University of London.^{[citation needed]}