One of the best habits I've built up over the past year or so, with the most consistent payoff, has been tidying the bedroom every day. Sometimes I get it done in the morning, sometimes it's not until just before dinner, but almost every day I return the room to calmness and breathe a sigh of relief and satisfaction just looking around.
I put away any clothes that are sitting on the floor, chairs, or dressers. I put the change from pockets into the coin jars (one for quarters and one for everything else) in our home office. I empty the trash basket and straighten the throw rug. Most importantly—and this happens virtually every day—I fluff the pillows and make the bed; so easy with just a sheet and duvet!
For the rest of the day and, most importantly, right before bed I see a space that's exactly how I want it: a calm, restful nest for a great night's sleep. In the morning, I'm greeted by a room with everything in its place, ready to launch a good day.