snakes comes

when I was an elementary school student, I couldn't whistle. but I wanted to be able to do it, so I practiced hard, and finally I became able to whistle. I was very happy, I whistled anytime. One night, I was whistling, then my father told me not to do it. I didn't understand why, so I asked him why I had to stop whistling. He said, "because snakes will come to you if you whistle on night". I thought it's illogical, so I said, "why do snakes come?", but he just said "because they come" angrily. I was very unhappy about it then. Now, it's strange, but I am accepting the words. it is because I became more "japanese" than I at that time maybe. if I could put a custom to japanese culture, it's "Siesta" in Spain. It's very pleasant to sleep, isn't it?