Women and men who begin sleeping more or less than six to eight hours per night are likely to age by four to seven years.
Among men, the cognitive function was similar for those who reported sleeping six, seven or eight hours; only short and long sleep durations of less than six hours or more than eight hours appeared to be associated with lower scores, according to a University College statement. The study used data for 5,431 participants (1,459 women and 3,972 men) from Phase 5 (1997-1999) and Phase 7 (2003-2004) of the Whitehall II study, which included more than 10,000 London-based office staff aged 35-55 working in 20 civil service departments in 1985. Although participants were mostly white-collar workers, the study group covered a wide socio-economic range with a 10-fold difference in salary across the occupational hierarchy. The authors concluded that adequate, good quality sleep is fundamental to human functioning and well-being. IANS
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