I gained it when I was 15yo and it followed me everywhere since (I am 40yo now), including work environments

Perhaps I'm missing something, why is it funny? :)

"soneca" it's a Portuguese word that means "sleep for a short time". Is something people usually do after lunch.

The literal translation is "nap"; but nickname origin is actually because it is how we call one of the Snow White's seven dwarves, Sleepy.

I used to sleep a lot during classes on high school. It's kind of a classic nickname

yeah, I remember soneca from the 7 dwarfs but I failed to mention it