How does Jigglypuff not fall asleep from its own song? Jigglypuff's song is seen to be extremely effective in putting people and Pokemon to sleep, but how does it not fall asleep from its own singing?

Shouldn't it at least fall asleep after it's done?
At first: As kuwaly mentioned, normally no one falls asleep while singing a lullaby. That's most likely the reason, but there are other possible points:


Like in the game, Pokémon using Sing aren't affected by the attack. This was most likely done to make this move usable, and was copied in the anime so the viewers aren't confused.
Some of the Pokédex-entries suggest, that you need to look in the eyes of Jigglypuff to be affected. As a Jigglypuff can't look itself in the eyes, it can't fall asleep. You can read the entries on Bulbapedia.


I also think I remember other Jigglypuffs falling asleep, too, but I'm not sure. That would mean, that Jigglypuffs aren't immune to the singing, but just aren't affected by their own attack.