I sleep in whatever I'm wearing for the day
Why do you sleep in your clothes?
I'm too lazy to change into my pajamas
It sounds rather uncomfortable. You put yourself in a very unhygienic situation which is not good for you.
It sounds gross but I do it. I'm not sure if other people do it or not. But recently, I never change into my pajamas.
These kinds of unhygienic practices can be harmful to your health. It doesn't take much time to change clothes so if you care for your health you should change your habit of sleeping in clothes you wear for the day.