The other thread raised a point as to whether it was acceptable to tell another adult (even if they are your employee) what time they should be home on a work night. So
Employers - Do you set a curfew? What time do you expect them home? Why? What if they want to be out later (movie and meal/consoling a friend/make use of cocktail night at local bar) Is curfew later at weekends?
Nannies/Aupairs - Do you have a curfew? Would it put you off a job?