"Light during the day—especially in the morning—advances your clock, so you get tired earlier in the evening, but light exposure late in the day or early night will delay your clock, pushing back the time that you will feel tired," says Horacio de la Iglesia.Rishiken/Shutterstock
Getting outside during the day, even when it’s cloudy, may benefit your sleep, research with college students suggests.
As reported in the Journal of Pineal Research, the study finds that University of Washington students fell asleep later in the evening and woke up later in the morning during—of all seasons—winter, when daylight hours on their Seattle campus are limited and the skies are notoriously overcast.
