Giving a 1 yr old benadryl to sleep?

So my son has been up most of the early morning. Happy and playing, normally he sleeps but not this morning. My mil kept telling him to be quiet and then wanted me to give him benadryl to go to sleep. I said absolutely not, that's for allergies and I dont medicate my children for my own selfishness. She claims lots of people do it. I really hope she is wrong. It says right on the bottle NOT TO USE TO MAKE CHILD SLEEPY.

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