My sister-in-law likes stud earrings because she can sleep in them. This blows my mind. It's never occurred to me to sleep while wearing my earrings. Of course, I also prefer wires and dangles to studs, and I've made a habit of removig my jewelry as soon as I get home. Even so, posts are a little stabby for bed, and I can't imagine wearing them to bed saves that much time in the morning.