I do because if we adapt to near vision, the eyeball elongates and is unable to focus at distance. Then it takes some effort and time to shorten the eyeball. Last time I checked the statistics in 2017, the average from like a million humans was correcting a quarter diopter a month, which is why it took people up to three years to get from -9 diopter myopia to not need correction.
Even animals trying to improve their focusing distance can't do it all at once, according to published research it. The eye responds to stimuli. Scientists didn't even expect instant results, which would be like doing splits the first day your try.
www.sciencedirect.com/.../S0275540897000033
If you haven't started I recommend wearing plus lenses when reading. Or at least keep the screen as far from your face as humanly possible.
Do you practice other habits such as looking far away or up at the clouds after a long period of reading?

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