I'm a college student and do most of my work from my dorm room, which is also where I sleep, eat, and socialize. For me, lighting is the main thing that helps me differentiate "work mode" from not-work mode. I have a video light mounted above my desk and a couple of bright 5600k plant lights in my window, all of which are on a light timer, in addition to my desk lamp. When I do work during the day, my desk is very well-lit. At night all of these get turned off (sometimes I turn the video light back on but set it to a much warmer color temperature and lower brightness for ambiance).