Hiragana Sleep-talking

I was incredibly sleepy.
I wasn't feeling well, either.
It's only natural to get sleepy when you're playing with your son in that state. As I moved the doll, I was nodding off, drifting in and out of consciousness.

My eyelids were heavy. My son's voice sounded distant.
My consciousness felt like it was being pulled away into a dream. And we still hadn't had dinner or a bath.
Just as I was treading the line between dream and reality, I suddenly woke up to the sound of my own voice.

"Are there really that many hiragana?"

Where did that line even come from?
My eyes snapped open with incredible intensity.
When I checked with my son, he said I had muttered it while I was dozing off. I wonder what kind of dream it was. I deeply regret that I can't remember it at all.

Dragging my sleepiness with me, I stood up, managed to finish dinner, and got into the bath. On the bathroom wall, my son's hiragana chart was posted.
It remains a mystery what happened in my dream that made me think, "Are there really that many?" But when I looked at that colorful chart again, the fifty sounds, containing infinite combinations, were lined up perfectly. The answer is simple: Yes, there are "that many."

"You know, there are fifty hiragana characters."

I replied to the me in my dream, like some kind of model. The water my son was splashing made a gentle sound.