The sleeping position is the body configuration assumed by a person during or prior to sleeping.
It has been shown to have health implications, particularly for babies. Research by Professor Chris Idzikowski, the director of the Sleep Assessment and Advisory Service, has suggested that the choice of position may indicate the type of person the sleeper is.[1]
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In the 1958 edition of his best-selling book The Common Sense Book of Baby and Child Care, pediatrician Dr. Benjamin Spock warned against placing a baby on its back, writing, "if [an infant] vomits, he's more likely to choke on the vomitus." However, later studies have shown that placing a young baby in a prone position increases the risk of sudden infant death syndrome (SIDS). A 2005 study concluded that "systematic review of preventable risk factors for SIDS from 1970 would have led to earlier recognition of the risks of sleeping on the front and might have prevented over 10 000 infant deaths in the UK and at least 50 000 in Europe, the USA, and Australasia."[2]
Pregnancy.org champions "SOS" (sleep on side), particularly the left side, for pregnant women, claiming this "will increase the amount of blood and nutrients that reach the placenta and your baby."[3]
It is recommended that people at risk of obstructive sleep apnea sleep on their side[4] and with a 30° or higher elevation of the upper body.[5] Snoring, which may be (but is not necessarily) an indicator of obstructive sleep apnea, may also be alleviated by sleeping on one's side.[6]
From his survey of 1000 people, Professor Idzikowski identified six positions and claimed to detect personality traits based on them[1]:
The remaining 11% stated their position varied or did not know. A Canadian survey found very different preferences, with 39% of respondents preferring the "log" position and 28% preferring to sleep on their side with their legs bent.[7]
A Travelodge survey found that 50% of British couples prefer sleeping back-to-back, either not touching (27%) or touching (23%). Spooning was next, with the man on the outside 20% of the time vs. 8% with the woman on the outside. 10% favored the "lovers' knot" (facing each other with legs intertwined), though all but 2% separated before going to sleep. The "Hollywood pose" of the woman with her head and arm on the man's chest was chosen by 4%.[8]
The Chinese feng shui and Indian Vastu Shastra systems describe favorable and unfavorable geographical directions (north, south, east, west) for sleeping. Feng shui also factors the configuration of the bedroom in the positioning of the bed.[9]