What a difference good lighting makes!
I sew in my living room, which is not well lit. It has a cathedral ceiling and the overhead light is not very bright. I had noticed this week that when I'm sewing at night I was getting agitated. Just a general feeling of nervousness. Couldn't figure out why. I started taking a look at different factors - the quilt I'm working on, other people in the house bothering me (nope, couldn't blame it on them, they've been staying out of the living room), my sewing set up. It dawned on me that it is a bit dim around my machine. Because of the machine light I could see the presser foot area just fine.
Tonight I moved a bright floor lamp over by my sewing machine. Ah! I have been sewing and feel fine.