Students will test their own genotypes at the circadian clock gene Per3that has been associated with sleep behavior preferences in humans. This gene’s coding region contains a VNTR (variable number tandem repeat) that is polymorphic (variable) across individuals.  Different variants of this VNTR have been associated with a preference for evening or morning activity–whether you are a morning or evening type. Students will assess their own genotypes, while also assessing their sleep phenotypes through a simple circadian questionnaire, with the ultimate goal of learning about circadian clocks and the study of genetic associations. Participate in an authentic open inquiry investigation on the genetic underpinnings of sleep.