I've always been a solitary guy. Except on potential Friday/Saturday nights when I may venture out to get pissed. I do like alone time. It amazes me how I've managed to hold on to my girlfriend for this long. Just a day where I can chill, read/paint in "silence". By silence normally meands having a movie on in the background for painting. not while reading, too distracting.
I believe I actually got Cabin Fever once, having spent a fortnight at home pretty much doing nothing. Went for a walk which seemed to negate the effects.