A person's school, work, or social life can be affected by the unusual sleep patterns. Adorable little girl sleeping in the bed with her toy. Beautiful asian young woman sleeping lying in bed with head on pillow comfortable and happy. Girl toddler sleeping on blue pillow illustration. In gastroesophageal reflux disease GERDstomach acid moves backward up into the esophagus, producing the uncomfortable, burning sensation known as heartburn. Beautiful teen girl wearing black top and sleeping in the bedroom.
One complete sleep cycle lasts about 90 to minutes.
Common Sleep Problems
Young beautiful woman sleeping in bed. During REM sleep, other physical changes take place — breathing becomes rapid, the heart beats faster, and the limb muscles don't move. Studies have found that many teens have trouble falling asleep that early, though. During adolescence, the body's circadian rhythm sort of like an internal biological clock is reset, telling a teen to fall asleep later at night and wake up later in the morning. Sign up to browse over million imagesvideo clips, and music tracks. But some scientists believe they have arrived at the magic number.