Some of the science on sleep:
Sleep efficiency and positive relations independently predicted IL-6 levels. The association of age (range of 61-90 years) and sleep efficiency was mediated by the presence of chronic health conditions and healthdriven limitations on activity. Elliot M Friedman, Mary S Hayney, Gayle D Love, Heather L Urry, Melissa A Rosenkranz, Richard J Davidson, Burton H Singer, Carol D Ryff. Social relationships, sleep quality, and interleukin-6 in aging women. Proc Natl Acad Sci U S A. 2005 Dec 8;102(51):18757–18762.

Household income (a median income of $25,000, range of $6,000–80,000) significantly predicted sleep latency and sleep efficiency. Education (a median of 2 years of college education, range 8–23 years of education) predicted sleep latency and sleep efficiency component scores. Elliot M Friedman 1, Gayle D Love, Melissa A Rosenkranz, Heather L Urry, Richard J Davidson, Burton H Singer, Carol D Ryff Socioeconomic status predicts objective and subjective sleep quality in aging women. Psychosom Med. 2007 Sep-Oct;69(7):682-91. doi: 10.1097/PSY.0b013e31814ceada. Epub 2007 Aug 31.

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