I've noticed that the sunglasses help me feel less agitated by my environment. In my odd scrambled way, having the sunglasses make things seem a little quieter. Then I put in my earplugs and things are just so peaceful.
When I ride my bike and it's quite cold the earplugs help keep the cold air from whistling into my ears. So, as I was riding I realised that with my ear plugs (less sound) and sunglasses (less intense visual input), I felt like I was gliding through silk. I have often enjoyed walking (or running) in twilight. I remember as a child running through the neighborhood or woods at twilight playing some kind of game. I was hard to catch. When I ride my bike to work on the paved hiking trail and it's still dark, I find it peaceful and I can still ride fairly fast.
So, here I am walking across the campus with earplugs, sunglasses, and my cool hard hat. We are required to wear a hard hat when we are out and about, and it looks like a cool construction sit guy sort of thing. No one ever looks at me odd when they see the ear plugs, because there are areas with loud machines in which ear plugs are required.
It's peaceful not to have to hear the ten vehicles in various places or the various machines in operation that my brain is trying to categorize and understand. Instead it is filtered out and things are much more quiet. Peaceful. One day when I got back to my desk I left the sunglasses on for hours and even left the ear plugs in for a while.
It bothers some people when I have them on and talk to them. I like people to take their sunglasses off as well, when I talk to them, so I need to be sensitive to that.
I've worn my sunglasses during the last two movies I saw in the theatre. It's much more pleasant. Unless I'm near the back of the theatre I find movies hurt my eyes. It's also so visually intense that its hard to take it in. The sunglasses mellow out the brilliance and make it much more comfortable.
The problem now is that I have to make myself not wear them. It would be easy to hide inside them all the time. I could just relax inside my darkened world, and be at peace. Then I would be recluse and not a real person. I wouldn't be able to really have relationships or help anyone or serve God quite right, because you can't have a real relationship with some one if they can't look into your eyes.