Summer Fatigue and Me

When I was in elementary school, every year before summer vacation, we were handed a printout with various warnings written on it.
It said things like, 'Maintain a regular lifestyle' and 'Be careful not to consume too many cold things'—well, that sort of content.

Among those, there was an illustration of a boy sitting down looking weak, accompanied by the text 'Beware of summer fatigue.'
As a lower-grade elementary student, this was the first time I had encountered the word 'summer fatigue,' but on the day of the closing ceremony, teachers have a mountain of things to hand out and don't explain every single printout.
Judging from the illustration, it seemed like a specific illness you catch in summer, but since the same printout also warned about 'summer colds,' I didn't quite understand the difference.

Of course, I later learned that summer fatigue is not so much an illness as it is a general term for feeling unwell due to the heat, but it still didn't quite click for me.
Why?
Because, of course, I had never experienced feeling unwell due to the heat.

It's been said many times, but it wasn't as hot in the past as it is now.
We didn't have air conditioning, but I don't remember even wanting an electric fan as a child.
And above all, children are energetic.
Even without plans to play with anyone, I would just go outside and wander around under the sun, but I have no memory of that being difficult, and outdoor events I had to attend—like radio calisthenics, swimming, or visiting relatives for Obon—were fun, not exhausting.

In other words, I had never experienced summer fatigue, and even after that, until I became an adult, I had no particular experience of feeling unwell in the summer.
The term 'summer fatigue' was not as familiar to me as it was widespread in the world.

But, however.
The abnormal weather caused by global warming has entered a truly otherworldly realm in the last few years.
This summer in particular is quite severe.

Even today, after going out briefly to run an errand, I've been spending the whole time in an air-conditioned room, but somehow my body feels heavy.
When I stand up, I feel a bit lightheaded, and even if I take a short nap, my head doesn't feel clear.

I thought maybe I was finally getting old and aging, but perhaps this is the very 'summer fatigue' I've heard rumors about.
Has this abnormal heat finally brought me the experience of 'fatigue' too...?

That's what I thought, but as always, I still have an appetite.
It might just be plain old aging after all.