A report from The Huffington Post examines the impact of screen time on the adult body and sleep.
Screen time at night keeps adults from falling asleep and sleeping well due to cognitive stimulation and sleep deprivation. Your brain’s electrical activity increases, neurons race and divert you from calming down into a peaceful state of mind for sleep.
In addition the physical act of responding to an email, text, or video increases the tension in your body which results in stress. Your body then produces the stress hormone cortisol released by the adrenal gland aversive to sleep.