Waking up during the night is frustrating, but it’s often completely normal—until it crosses a specific threshold that signals hidden health issues.

No doubt you've heard about the importance of proper sleep to the point of redundancy. Weight gain, performance loss and irritability are among the many effects we worry about when we don't get enough ...

Sleep Cycles: One rapid eye movement (REM) stage and three non-REM stages that altogether last about 90 to 120 minutes Benefits: Physical and mental recuperation and memory consolidation Disorders: ...

When you picture the ideal night of sleep, what comes to mind? For many people, it’s (at least) eight blissful hours of uninterrupted snoozing. There’s no sound of snoring in your ear. No ...

You may remember little to nothing when you wake up, but there’s a lot going on while you sleep. You just spent the previous seven to nine hours moving through a highly structured cycle of sleep ...

Sleep is central to the proper functioning of the immune system, which in turn has implications for mental and physical health. Sleep disturbances have been linked to poorer immune responses against ...

Sleep is kind of a big deal. It’s the best way for our bodies to recover after a hard day, and it also greatly influences our cognitive functions and immune responses. Yet while many of us focus on ...

We are always told how important a consistent sleep schedule is for our mental and physical well-being. But, in our 24-hour society, not everyone can afford this luxury. Research has highlighted the ...

This article was reviewed by Felix Gussone, MD. "Stiffness" is often considered a sign of male arousal, but it’s not uncommon to experience it even when you’re not turned on. Nocturnal arousal refers ...