Sleep

Brain wave studies suggest that when it comes to eating and sleeping, reindeer multitask to survive in the harsh Arctic

A theory holds that dreams are a way for the visual cortex of the brain to “defend its turf” against being “taken over” to process inputs from other senses

Brain waves during sleep influence glucose and insulin, offering new insights into controlling diabetes

A light midday snooze boosts memory and other types of cognition—and your mood

New research suggests that hitting the snooze button to squeeze in an extra five or 10 minutes of sleep may actually be good for you

Scientists have found a feedback loop between poor sleep and migraine attacks, and breaking the cycle could be key to treatments

A new study finds that we respond to simple commands, such as smiling or frowning, in certain phases of sleep

Nightmares are unpleasant, but waking someone in the midst of one isn’t the best way to handle them—here’s why

We only remember a fraction of our dreams, and even those slip away if we don’t try to remember them—here’s why

An analysis of previous trials suggests blue-light-filtering lenses may not reduce eyestrain or sleep problems

Here’s the science on whether naps have short- and long-term benefits for your health

A sleep researcher who studies what dreams can tell us about the possible onset of some mental disorders believes lucid dreamers might hold a lot of answers in their head.