This is crucial for so many reasons. The top reason is to calm your mind. There is nothing worse for my night's sleep than leaning over and grabbing my phone for one last look before I go to sleep. I typically end up seeing an email or notification on social media. Most times in that moment I make the decision to check the new email or notification and I regret it. My mind starts racing with planning, problem solving, or worrying and I have just lost some precious rest time.
When we make the decision to start looking at our phone, TV, or laptop screens in bed instead of focusing on resting, our serotonin levels are increasing due to the light on the screen (not including the psychological impact of what we are looking at). When this happens, melatonin (the sleep hormone) is delayed for up to three hours. This can explain why we can check our phones before bed, roll over, fall asleep, and wake up feeling like we need more rest. When our melatonin is low it makes getting a quality night sleep next to impossible.