Titova OE, Lindberg E, Elmståhl S, et al. - According to this Swedish study, self-reported sleep qualities may differ depending on the season.

• The researchers had access to data from 19,254 people (93.8% of the initial sample size).

• In comparison to those interviewed in the autumn, individuals polled throughout the summer (June–August) were more likely to report low sleep duration (defined as ≤ 6 hr).

• When compared with participants surveyed in the autumn (September–November), those interviewed in the winter (December–February) were less likely to report early awakenings.

• When compared with those interviewed in the autumn, complaints of difficulty falling asleep and disturbed sleep were less common among those interviewed in the spring (March-May).

• There were no seasonal differences in reports of extended sleep, difficulties maintaining sleep, or feeling unrested after sleeping.

• According to additional subgroup analysis, summer participants were more likely than winter participants to report short sleep duration and early morning awakenings.