An evolutionary instinct called the 'first night effect' makes us prone to staying alert in new places -- in order to keep safe.

The rise of sleeptech has turned rest into something that can be tracked, optimized, and gamified.

The nights getting hotter due to climate change may lead to a corresponding increase in mortality, a new study warns.

Midnight makes the brain inclined towards addictive behavior, suicidal ideation, and other high risk situations.

The fight to save sleep and value rest is more complicated than it appears.

Bad dreams allow people to process negative emotions as they lay asleep, undisturbed -- reducing emotional distress when they're up.

Sharing a bed with our romantic partners can reduce anxiety and depression, besides allowing us to fall asleep faster and sleep longer.

“Our bodies are highly adapted to maintain a stable core body temperature, something that our lives depend on.”

"Sleep... help[s] us solve problems by accessing information that is remote to the initial problem [and] may not be initially brought to mind."

The study surveyed 840,000 people to show why -- and to what extent -- someone's sleep timing influences their mental health.

The finding is one of several new studies to suggest animal's brains function more similarly to human's than previously thought.

A new large-scale study of napping habits and genomes suggests "daytime napping is biologically driven and not just an environmental or behavioral choice."

It's more than just feeling tired.

It's too early for a tension headache, but there are a few other reasons why you might wake up with a headache.

If anything, the constant auditory stimulation of white noise seems to disrupt sleep, suggests a meta-analysis of 38 studies.

When we cry, our heart rate increases and breathing slows down, reducing the amount of oxygen the brain receives, which leads to drowsiness.

There are behavioral and physiological components to the need to cover ourselves with a blanket or sheet while sleeping.

People have on average 4-6 dreams per night, and forget most of them.