I love these earrings. I've been wearing them (2 pairs, I have double pierced ears) day and night. I find the two smaller styles better to sleep in. The "fatter" pair is okay to sleep in, but I could feel them when I slept on my side. I do not have overly sensitive ears and these have not bothered my ears or turned my ears any un-natural colors. The post is a little larger than a standard post size, so when I first put them on, it was a little painful. I fully expected my ears to get "crusty"; however, my ears did not get "crusty" and only sore a little for a couple of days till my holes adjusted to the post size. I do not wear these when I shower and I use alcohol to clean the posts. I love these so much that I purchased a set for my daughter. She hasn't received them yet; but she has very sensitive ears and multiple piercings. If she has any issues, I will update this post.