Changes in the seasons affect myriad forms of life on Earth. Deciduous trees shed their leaves in fall before regrowing them in spring. Bears, squirrels, turtles, and various other animals hibernate, their metabolisms falling to a near standstill. The snow hare and ermine don brown fur in summer and white fur in winter. And as a new study finds, humans seem to be seasonal as well, experiencing marked changes in the duration and structure of our sleep throughout the year.
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