Before I installed a security camera at the front door I wouldn't even bother opening it if I was in my jammies with sleep hair... it's usually just Jehova's witnesses or door hawkers. (One time it was a guy who wanted to see if anyone was home before he forced the door...)
Now if I see a van in the driveway then I know I can open the door, regardless of my dress or hair state, cos I'll probably never see them again anyway.
PS: It's 10:57am and I am currently in my jammies with hair sticking out everywhere