As we mentioned above, your brain won't be able to fall asleep if you have too much light. This is what makes using electronic devices in bed quite dangerous, as most LED screens emit stronger lights at closer distances than most standard bulbs, and even natural sunlight.
If you want or need to use your devices late, always turn down the brightness (or put it in "night mode"). Otherwise, it is strongly recommended to store your devices one hour before bedtime - either on a nightstand or in our practice. Felt bedside pocket 一 to give your eyes a break!