There are a few attacks in the Super Smash Bros. series that cause the sleep effect. Characters hit by such attacks will be put to sleep instead of taking knockback. If the target is already asleep, the length of the effect will not be increased or reset.
List of sleep attacks
By characters
| Character | Move(s) | Games |
|---|---|---|
| Daisy | Daisy Blossom | 
|
| Jigglypuff | Sing |    
|
| Luigi | Negative Zone |
|
| Peach | Peach Blossom |
|
| Sleepy Toad |
|
By items
| Item | Attack | Games |
|---|---|---|
| Assist Trophies | Riki: Bedtime |
|
| Poké Ball Pokémon | Bellossom: Sweet Scent |
|
| Darkrai: Dark Void |
| |
| Ditto: Transform (if the summoner is Jigglypuff) |
| |
| Togepi: Metronome (Sleep Powder) |
|
By enemies and bosses
| Enemy/Boss | Attack(s) | Games |
|---|---|---|
| Master Hand | Sleeper Grab |
|
| Master Hand and Crazy Hand | Applause (combo move) |
|
| Petilil | Sleep Powder | 
|
| List of attack effects | |
|---|---|
| Introduced in Super Smash Bros. | Normal  • Coin  • Electric  • Flame  • Slash  • Sleep 
|
| Introduced in Super Smash Bros. Melee | Bury  • Darkness  • Flower  • Freezing  • Grab  • Inert  • Reverse  • Screw  • Stun 
|
| Introduced in Super Smash Bros. Brawl | Aura  • Down  • Flinchless  • Grass  • Paralyze  • Plunge  • Slip  • Water 
|
| Introduced in Super Smash Bros. 4 | Blaster  • Magic  • Obliviate  • Stab  • Solar 
|
| Introduced in Super Smash Bros. Ultimate | Autoreticle  • Chain  • Curse  • Dedede  • Grapple  • Ink  • Mushroom  • Poison  • Rapid  • Sparks  • Fist-Down  • Scintilla 
|