How do you know when it’s time to unplug? What do you do to make it happen?

I tend to know when my head starts to hurt or my eyes get tired.

I then unplug from tv and/or phone to read, take a walk or listen to ocean sounds from my sound machine,

I also take extra time to unplug by going to the lake or a neaby lighthouse( unfortunately an hour away-2 technically because I do have to come back!- or do I? 🤣)