How to force yourself to 'switch off'?

Dear IH,

Do you have any tips/ routines on switching off for the day?

Unlike a regular job, there is no real time-limit for working on your project. And the more you work, the more you can get done -> faster reach where you want to be.

However, I also realize, if I don't time off, it will affect productivity long term.
So what are your routines to switching off work? How do you get yourself to stop checking on results and disconnect?