Some define "short sleepers " whom sleep 6 h and less per night and others use duration less than 7h of sleep. Long sleepers are defined as sleeping 9h and more in most epidemiology studies. At the same time National Sleep Foundation recommended sleep duration is 7-9h.
Here are references of a few studies which may help you to define short and long sleepers for an epidemiologic study. They all show that sleep duration critically depends on factors like age, gender, economic situation, health status, and others.
Good luck,
Hartmut
Kripke DF, et al. Sleep complaints of postmonopausal women. Clin J Women's health 2001; 1:244-252.
Monk TH, et al. A sleep diry and questionnaire study of naturally short sleep. J Sleep Res 2001; 10:173-179.
Basner M; Fomberstein KM; Razavi FM; Banks S; William JH; Rosa RR; Dinges DF. American time use survey: sleep time and its relationship to waking activities. SLEEP 2007;30(9):1085-1095.
Putilov AA (2013) Patterns of Association of Health Problems with Sleep-Wake Timing and Duration. J Sleep Disor: Treat Care 2013, 2:4 (doi:http://dx.doi.org/10.4172/2325-9639.1000120)
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