Artificial lights also interfere with sleep. If you’ve ever been 100% off grid, or even a place where you have minimal phone usage and little artificial light y

Artificial lights also interfere with sleep. If you’ve ever been 100% off grid, or even a place where you have minimal phone usage and little artificial light you will feel sleepy more correlated with when the sun sets, even if it’s at 1800. I’ve found blackout shades useful for when I’m not sleeping a schedule correlated with the sun (eg work at 4 am) or external artificial light (streetlamps).