maybe you are a warm-blooded person who needs sunlight, and then when the moon comes out cold-blooded creatures come out. Then the little creatures fly into the sky and start making spells to the least warm-blooded. So you see, you're sad at night because all the other warm-blooded-ish people are being cursed and killed off at night. 😄 Have a good night sleep! Make sure you stay really warm you might be cursed!