A lot of people are referencing meditation. Ultimately that's not a terribly well-defined word. It may match some broad ones, but there's a lot of narrow ones that it wouldn't.
If staring at a wall helps then don't let me stop you but I've sometimes done something very similar by just sitting in a chair without any cell phone, book, electronic item, etc. until I'm very bored. Not like "gritting my teeth, come on we can do another 15 minutes let's goooooo" like an exercise push, but definitely waiting past the first couple of twitches of boredom until it's a constant. It's kind of an interesting way to start a vacation, really helps disconnect from work very quickly. It can be some hours, though.
I do find that this only happens for me if I'm "doing nothing". I see others suggesting exercise, or something else, and those are absolutely good in their own way. But they are not the same thing as just doing nothing. It's still trying to do something and "use the time productively".
The downside is that the family just sees a guy sitting there "doing nothing" and can find a dozen reasons to interrupt... it's hard to do this when there are any other people around, and while I'm not an absolutist about a plan that can be summed up as "sit until you can't" without much loss, the interruptions do very quickly diminish the utility. There's a huge difference between sitting uninterrupted for an hour, and sitting for 15 minutes, putting away the dishes, sitting for 15 minutes, getting up to help reach something, sitting for 15 minutes, explaining that yes you really are sitting there just doing nothing would you please just let me do that, and sitting for 15 minutes.
This particular thing doesn't match "meditation" to me, because I'm not even doing the minimal thing meditation involves; I'm not concentrating on breathing, not trying to "not think", not trying to do anything. If the mind races, let it race until it is done racing[1]. In this point in particular this certainly doesn't match a lot of specific meditation traditions. If the thought of doing something occurs to you, that meditation technique of letting it pass through you until it disappears can be useful.
If meditation is a deliberate attempt to slow down, or a deliberate attempt to concentrate on some particular thing, or a deliberate attempt to empty one's mind, it still has a deliberative goal. If you're willing to broaden the term to encompass not even having that much of a plan, then I have no objection. But this feels to me too low level to even justify the term meditation as most people use it. If you're "trying" to do anything at all, then this isn't really what I'm talking about here. I'm not saying this is "better" than meditation, I'm more saying I'm not sure this even rises to that level, as low as some of them may be. It's really just "rest", a concept our century and culture has largely lost track of.
(Of course the obvious semantic argument about "well are you trying to not try, hmmmmmm?" is there and you are free to debate that in your own head, because like I said, I'm not trying to be absolutist about this. This isn't a program I'm proposing so much as an experience report. You do whatever and call it whatever and argue about definitions as much as you like.)
[1]: If your mind literally never stops this may not work for you... that said, in the 21st century, are you sure your mind never stops racing if you just let it run itself to exhaustion? Have you ever tried? It could be some hours, plural. Again, I fully acknowledge that some people reading this can say "yes". I acknowledge the existence of great neurodiversity. But if you've never tried just letting it run itself to exhaustion you may be surprised what happens if you can find the time to let it.