Try staying still and "doing nothing" when your head is a beehive of thoughts, ideas, emotions, intentions, and desires.
Sadly, I often end up scrolling.
It gives the illusion of "stopping", but it doesn't help the beehive.

So I have a collection of "rest activities". Jigsaw puzzles. Listen to a podcast or watch a TV series. Read a book. Listen to a song. Physical activity of course, but that's off the table, particularly with this heat.
I'm going to add writing.
Not for the content, but for giving my brain a linear experience without input. Because input feeds the bees.

Stephanie Booth shares her handwritten (!) thoughts on a particular activity to help slow down: Making the Bees Walk in Line