When I'm feeling beige, I tidy the house and cook something nice. The net result is a feeling of virtuous achievement supported by the delicious smell of whatever's cooking plus (of course) the comforting tidiness of the house. If that doesn't do the trick, I do a load of laundry and some ironing; then dress up and go to the movies.

Do not, under any circumstances, plop down in front of the telly or retreat to bed with a book and a box of sweeties. Keep that for when you're sick with a physical disease (i.e., like Raptor).