Experts suggest that the main reason why it’s hard to fall asleep after using your phone is that you don’t have time to settle down. Lots of people play right in bed, some read the news, and others flip through their social media feeds. All of these activities can excite you both mentally and physically.
Curiously, many of these actions cause your body to produce cortisol, the stress hormone. Such as if you’ve read the disturbing news, or if an online game has a monster chasing you. Cortisol doesn’t let you sleep, on the contrary, it wakes you up since you can’t sleep under conditions of “anxiety and danger”!