Sleeping on overnight buses changed how I deal with light

I took a long bus trip across Europe and struggled to sleep with all the streetlights flashing by. I mean, I used to rely on total darkness at home. Maybe it's just me, but I started wearing a beanie pulled down over my eyes instead of an eye mask. It blocks light better and feels less bulky in my bag. Now I pack a beanie for every trip, it's my go-to hack.