Nightwear

A woman's nightgown
A man's pajamas

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.

Customs

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[1]:

What worn for sleeping Men (%) Women (%) All (%)
Nothing/nude 31 14 22
Underwear 31 2 16
Nightgown/Pajamas 13 55 34
Shorts/t-shirt 21 25 23
Sweatshirt/sweatpants 1 2 1
Something else 3 1 2
No opinion 1 1 1

A survey by the BBC The Clothes Show Magazine in 1996 revealed the following about sleepwear in the UK[2]

% Pyjamas Nothing Underwear Nightdress Other
Women 37 17 9 33 4†
Men 6 47 22 - 25†

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

References

Notes
  1. ^ "American Sex Survey". abcnews. 2004. p. 26. http://abcnews.go.com/images/Politics/959a1AmericanSexSurvey.pdf. Retrieved 2009-09-04.  Short Analysis here
  2. ^ The Clothes Show Magazine, May 1996, BBC Magazines