Researchers led by Masako Tamaki at the RIKEN Center for Brain Science in Japan report a link between deep sleep and cerebrospinal fluid, the clear liquid that surrounds and supports the brain and ...

When people believe they’ll be restless under a full moon, that expectation alone can be enough to keep them awake.

Researchers trace how different sleep stages may fine-tune what we remember, trading specifics for more general knowledge.

A study identified five sleep types that could be linked to mental well-being, bedtime habits and brain activity. The findings could help improve clinical treatments.

You learn what your body can do on little sleep but also what it can’t do on little sleep,” he says. These days, as a doctor ...

Busy people sometimes say that they will “sleep when they are dead.” The irony is that sleep deprivation harms your health ...

In TODAY.com's Expert Tip of the Day, a cardiologist explains why nighttime is important for cardiovascular health.

Ever wake up with a sore lower back or achy shoulders that just ruin the rest of your day? Or get up from bed and try to greet the morning, only to find your neck is too stiff to turn to the window?