I only use my glasses to let my eyes rest, so I think it's the opposite.

Anecdotally.

Afaik, to rest your eyes you need to look in the far distance, like the end of a street. For at least 20 sec at a time

Your head might need the rest from the glasses on your head, but when you take your glasses off your eyes have to work harder to compensate. So, the idea is sound, but the explanation is wrong.

I suppose this varies from person to person and I can only speak as a glass wearer with some.. uhhh.. 30-ish years of practice: your eyes can get tired. I have some days when I can't stand the feeling of my glasses and have to take them off a lot. My experience is that contacts make me really tired, much more than glasses. It's like my brain refuses to function if I see like a normal person. It's all just anecdotal unless a medic confirms it though :)

I think it depends, farsighted? Probably not.

Nearsighted looking at things hopelessly out of focus and not trying to look, perhaps.

I'm very nearsighted amd taking my glasses seems to make them relax, since nothing will be close enough to make them focus.

Somebody that's farsighted might strain their eyes to focus without their glasses.