Primp indoor plants
-- Boost humidity around houseplants. It's one of the best things you can give them this time of year. Misting doesn't help, but a tray filled with pebbles and a quarter inch or so of water will be most appreciated. Also, turn up your humidifier as high as you can (without creating condensation on windows). Both people and plants will feel better for it!
-- Evaluate houseplants. If they're struggling, it's probably time to pitch them and replace them as needed. Otherwise, give plants a good rinse in the kitchen sink or shower, trim off brown or problem parts, and top off the soil with fresh potting mix. But don't fertilize houseplants this month. With less daylight, their need for food is reduced.