Seeing someone sleepwalking can be confusing. Should you wake them up? Here's what's really happening when someone sleepwalks and what you should do.

REM stages and one REM stage. Ideally, you repeatedly cycle through each stage. Learn how long each stage lasts.

"Sleep is regulated by the levels of two hormones: melatonin and cortisol, which follow a regular 24-hour pattern. Melatonin helps you fall asleep, while cortisol aids in waking you up and keeping ...

"A person with dementia may struggle with sleeping at night, and may sleep more during the day. They may find it challenging to fall asleep or they may wake up frequently during the night.