Event Match 39: Jigglypuff Live! is an Event Match from the Event Mode in Super Smash Bros. Melee. In it, the player plays as Jigglypuff (SSBM)|Jigglypuff]] against 3 other wierd people on the Pokemon Stadium stage. The player must KO the three other Jigglypuffs to win.
If Jigglypuff uses Sing on this stage while the screen in the background of Pokemon Stadium is focused around it, all three of the other Jigglypuffs on the ground will fall asleep, and for much longer than they usually would. This easter egg is known as sleepy time. The effect is not unlike Peach Blossom, Peach's Final Smash in Brawl.
It is possible that the number of this event refers to Jigglypuff's number in the National Dex in the Pokémon games: #039.