This article contains information for a confirmed feature that is not currently available.
The subject was confirmed by an official source, but is not present in the current version of the work bound to appear. Instead, it is meant for a future update. Any information is subject to change.
Sleep is a future effect in Super Smash Flash 2 which characters will make character to fall asleep after they have been hit or come in contact with a certain move. Characters are not able to move or do anything while under this effect, very similar to stun, which leaves them open.
↑Because this feature is yet to be fully implemented as of the most recent revision of the Beta version, these elements instead stun opponents, save for the few characters that use their sleep animation for their stunned animation.
Though this feature is not yet implemented, there are three characters that enter a sleep animation whenever they are stunned, these are: Bandana Dee, Marth, and Sandbag.