Other studies have indicated that average sleep time declined from 9 hours in 1900 to 7 hours in the 1970s, and that things have gotten worse ever since as modern life has become more hectic.
[the new study] not wanting to rely just on diaries, researchers attached monitoring devices to 669 middle-age test subjects to record when they actually slept. Though they spent an average of 7.5 hours a night in bed, the study participants slept just 6.1 hours.
[See also summary at uchospitals.edu and scienceDaily copy]
"Eaerly to bed" always good? Maybe not:
'Early awakening has been associated with greater powers of concentration, being busier and experiencing more hassles through the day, as well as having more anger and less energy at the end of the day.
'On the other hand, late wakers were more leisurely and less busy. It is possible the cortisol may contribute towards these differences in temperament because it is known to influence mood and concentration,' she said.
In follow-up research over a 10-week period, it was found that the early risers were more likely to suffer from muscle aches, colds, headaches and mood swings.
AND: "At Southampton University in a study published in the British Medical Journal involving 1229 men and women over a 25-year period it was found that those who burned the mid-night oil and slept in [later] the following morning suffered no ill effects..They also proved to be slightly wealthier than the early risers and no less healthy. [they also assume which way the cause-effect is or correlaction re quoting yes, i've heard of it, the "[retirees and others] who sleep more alterin life <----> morehealth problems"]