It's the same belief we have. There are other beliefs that is just funny but it just makes you curious and even dared to try if it is true just to prove it. I haven't heard about the whistling at night invites trouble but in our culture you are calling for a snake if you do whistle at night so in a sense that is related. It never happened to me though not matter how long and loud I whistle at night lol!
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Welcome to the world of superstition :)
Haha! I'm not really new to this world of superstition. Maybe a different world of superstition as there are lots of others from place to place.