Medically reviewed by Smita Patel, DO Hypnic jerks are sudden muscle contractions that happen as you fall asleep. They are ...

Insomnia is often used as a catch-all term to describe a whole slew of sleep problems. Trouble falling asleep, waking up in the middle of the night and not being able to fall back asleep, and waking ...

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: ...

Insomnia is the most well-known sleep disorder, but it’s far from the only one. Countless people of all ages struggle with sleep disorders that negatively affect the quality of their sleep, cause them ...