Heart alarm while sleeping: Munich's top doctor warns of four dangers. Poor sleep puts the body under stress and can increase blood pressure.
Seven to nine hours of sleep is considered optimal. For children, bed rest may be longer depending on their age. These devices work with blue light, which can affect your biorhythm. You should put your cell phone aside at least an hour before going to bed. It's best to leave your phone in another room. Put your phone or tablet aside at at least one hour before bed.