A sleep neurologist explains the science.

A psychologist explains how to boost your mood, and your sleep, on a cloudy day with light therapy.

Increased light exposure can have positive and negative effects on your health — depending on the time of day.

Without an alarm clock set for school, sleep routines are anything but routine right now in many homes.

Before ringing in the new decade, a quick look back at the blog’s most read stories of the year.