Jim Kwik explains how blue light from screens disrupts sleep. Wear blue-light-blocking glasses if you use devices before bed, and get bright light exposure in the morning to align your body's natural rhythms.
Chapters
What should people know about their screen time before they go to bed? If you're going to be using some screen time, putting on those glasses is a really strong habit to get a hold of. If you're not going to be disciplined to say that you're not going to look at screens, I would even suggest putting on those glasses anytime in the day because that stimulation is never positive. Everything in daytime daylight is all the stimulation you naturally need. Some people need a shock of light in the morning if they want to accelerate that morning routine. But when it comes to preparing for nighttime and the onset of the less of that blue light axis that you're triggering your brain with, the better you are.