I guess I'm religious. I've been tying my hair up "routinely" for many, many years. In fact, I've been doing it since I was a pre-teen. Before I started doing my own hair (around 12-13 years old), my mother made sure our hair was tied down with a scarf so that it didn't look a hot mess for school in the morning. When I got old enough to do my own hair, I kept up the routine. It saved me time in the morning getting ready for school, because I styled my hair mostly before bed with rollers or a ponytail (what have you) and tied it up. I just had to hit the edges with a little gel and refresh the curls in the morning.
Even nowadays I can't stand having to wake up and do my hair in the morning. If its anything more involved than throwing it in a ponytail/bun or fluffing it/combing down a wrap, then I am not doing it. Maybe that's why I have grown into wearing styles that will look good daily for at least a week without me touching it. I just tie it up at night, get up, throw off the scarf, maybe smooth the edges, a little oil shine spray if needed, and go!!
ETA: When I don't tie my hair up at night, my hair is a dry, tangled, rough-looking mess, no matter what style its in.