Deep Sleep is an Archetype of Level 3 and 6 DARK monsters with various Types. They also have a single Level 8 boss monster, as well as new Xyz Monsters. They focus on changing your opponent's monsters to face-down Defense Position and making them unable to change their battle position, which they do by their shared effect that flips themselves and an opponent's monster face-down. Along with that, their Level 6s gain a boosted effect if they used their Level 3 counterpart, and newly also gain even more boost if they control their Field Spell Dream Abyss. Their name and theming refer to sleep and dreams in general, and the Level 3s all share "Shadow" and the Level 6s all share "Nightmare" in their names.
When updating this one, I decided to focus on their Field Spell boosting them, as well as adding Xyz Monsters, which are not their main playstyle, but felt like they had no use for the Extra Deck regardless, so why not give them a few more options, and another boss monster option. They also needed more searching options, since they are mostly focused on face-down and Tribute Summon mechanics, so they needed something to power them up a bit. I also don't know if Nightmare Dreamer technically would be able to use its alternate Summoning method, but let's just say it's the exception to the rule considering that the whole point is to flip Shadow Dreamer face-down in the first place.
Original Version (11/11):
Main Deck Monsters:
Deep Sleep - Shadow Demon
Fiend/DARK
Level 3
You can target 1 Attack Position monster your opponent controls; change both this monster and that target to face-down Defense Position, and if you do, neither monster can change its battle position. You can target 1 monster on the field in face-down Defense Position; change it to face-up Attack or Defense Position. You can only use this effect of "Deep Sleep - Shadow Demon" once per turn.
1300/1600
Deep Sleep - Shadow Creature
Beast/DARK
Level 3
You can target 1 Attack Position monster your opponent controls; change both this monster and that target to face-down Defense Position, and if you do, neither monster can change its battle position. If this card is flipped face-up: You can take 1 "Deep Sleep" card from your Deck, except "Deep Sleep - Shadow Creature", and either add it to your hand or send it to your GY. You can only use this effect of "Deep Sleep - Shadow Creature" once per turn.
900/1800
Deep Sleep - Shadow Ghost
Zombie/DARK
Level 3
You can target 1 Attack Position monster your opponent controls; change both this monster and that target to face-down Defense Position, and if you do, neither monster can change its battle position. When this card Summoned: You can discard 1 Level 3 or 6 "Deep Sleep" monster, then apply 1 of these effects, depending on the Level of the discarded monster (but you cannot apply that same effect of "Deep Sleep - Shadow Ghost" again this turn);
● Level 3: Special Summon 1 Level 6 "Deep Sleep" monster from your hand. If you control "Deep Sleep - Dream Abyss", you can Special Summon the monster from your GY instead.
● Level 6: Special Summon 1 Level 3 "Deep Sleep" monster from your hand. If you control "Deep Sleep - Dream Abyss", you can Special Summon the monster from your Deck instead.
1200/1700
Deep Sleep - Shadow Witch
Spellcaster/DARK
Level 3
You can target 1 Attack Position monster your opponent controls; change both this monster and that target to face-down Defense Position, and if you do, neither monster can change its battle position. If you control no other face-up monsters: You can change this card to face-down Defense Position, then add 1 "Deep Sleep" card from your Deck to your hand, except "Deep Sleep - Shadow Witch". You can only use this effect of "Deep Sleep - Shadow Witch" once per turn.
1500/1500
Deep Sleep - Nightmare Demon
Fiend/DARK
Level 6
You can target 1 Attack Position monster your opponent controls; change both this monster and that target to face-down Defense Position, and if you do, neither monster can change its battle position. If this card is Tribute Summoned by Tributing a monster in face-down Defense Position or a "Deep Sleep" monster: You can target 1 monster your opponent controls in face-down Defense Position; return that target to the hand. If this card was Tributed Summoned by Tributing "Deep Sleep - Shadow Demon", add this additional effect.
● Also, after that, you can change 1 monster on the field in face-down Defense Position to face-up Attack or Defense Position. If you control "Deep Sleep - Dream Abyss", you can change 2 monsters instead.
2400/2200
Deep Sleep - Nightmare Creature
Beast/DARK
Level 6
You can target 1 Attack Position monster your opponent controls; change both this monster and that target to face-down Defense Position, and if you do, neither monster can change its battle position. If this card is Tribute Summoned by Tributing a monster in face-down Defense Position or a "Deep Sleep" monster: You can activate this effect; your opponent sends 1 of their face-down monsters to the GY. If this card was Tributed Summoned by Tributing "Deep Sleep - Shadow Creature", add this additional effect.
● Also, after that, you can add 1 "Deep Sleep" card from your Deck or GY to your hand, except "Deep Sleep - Nightmare Creature", then if you control "Deep Sleep - Dream Abyss", you can add 1 "Deep Sleep" card from your GY to your hand.
2300/2300
Deep Sleep - Nightmare Ghost
Zombie/DARK
Level 6
You can target 1 Attack Position monster your opponent controls; change both this monster and that target to face-down Defense Position, and if you do, neither monster can change its battle position. If this card is Tribute Summoned by Tributing a monster in face-down Defense Position or a "Deep Sleep" monster: You can target 1 monster your opponent controls in face-down Defense Position; take control of that target. If this card was Tributed Summoned by Tributing "Deep Sleep - Shadow Ghost", add this additional effect.
● Also, after that, you can Special Summon 1 "Deep Sleep" monster from your hand, except "Deep Sleep - Nightmare Ghost". If you control "Deep Sleep - Dream Abyss", you can Special Summon it from your Deck instead.
2100/2500
Deep Sleep - Nightmare Witch
Spellcaster/DARK
Level 6
You can target 1 Attack Position monster your opponent controls; change both this monster and that target to face-down Defense Position, and if you do, neither monster can change its battle position. If this card is Tribute Summoned by Tributing a monster in face-down Defense Position or a "Deep Sleep" monster: You can target 1 monster your opponent controls that was Special Summoned from the Extra Deck; return it to the Extra Deck. If this card was Tributed Summoned by Tributing "Deep Sleep - Shadow Witch", add this additional effect.
● Also, after that, you can change 1 monster on the field to face-down Defense Position, but its controller cannot change its battle position, then if you control "Deep Sleep - Dream Abyss", draw 2 cards, then discard 1 card.
2200/2400
Deep Sleep - Shadow Nightmare
Fiend/DARK
Level 8
Cannot be Normal Summon/Set. Must be Special Summoned by Tributing 2 or more monsters in face-down Defense Position. If Summoned this way: You can target 1 face-up monster and 1 face-down monster on the field; return both those targets to the hand. Once per turn (Quick Effect): You can target face-down monsters on the field up to the number of monsters Tributed for this card's Special Summon; change them to face-up Attack or Defense Positions. While you control "Deep Sleep - Dream Abyss", banish any of your opponent's cards that would be returned to the hand or Extra Deck.
3000/3000
Extra Deck Monsters:
Deep Sleep - Shadow Dreamer
Psychic/DARK/Xyz
Rank 3
2 Level 3 "Deep Sleep" monsters
You can detach 2 materials from this card; change as many monsters on the field to face-down Defense Position as possible, and if you do, neither player can change their battle positions. When your opponent activates a card or effect while this card is in face-down Defense Position (Quick Effect): You can change this card to face-up Defense Position, then negate the activation, and if you do, destroy that card.
1500/2500
Deep Sleep - Nightmare Dreamer
Psychic/DARK/Xyz
Rank 6
2 Level 6 "Deep Sleep" monsters
You can also Xyz Summon this card using a face-down "Deep Sleep - Shadow Dreamer" you control as material. (Transfer its materials to this card.) You can detach any number of materials from this card, then target the same number of face-up monsters on the field; change them to face-down Defense Position, and if you do, neither player can change their battle positions. Once per turn, if you control no other other face-up monsters, if this card battles an opponent's monster, at the start of the Damage Step: You can return that card to the hand, and if you do, inflict 1000 damage to your opponent.
2500/2500
Spells/Traps:
Deep Sleep - Dream Abyss
Field Spell
All "Deep Sleep" monsters you control gain 300 ATK and DEF. Once per turn, if all monsters you control are in face-down Defense Position: You can target 1 face-down Defense Position monster you control; change it to face-up Attack or Defense Position. During your Main Phase, you can Tribute Summon 1 "Deep Sleep" monster in addition to your Normal Summon/Set by Tributing 1 face-down monster. (You can only gain this effect once per turn.)
Deep Sleep - Waking Nightmare
Normal Spell
Special Summon 1 "Deep Sleep" monster from your hand in face-down Defense Position. If you control "Deep Sleep - Dream Abyss", you can Special Summon it from your Deck instead. You can only activate 1 "Deep Sleep - Waking Nightmare" per turn.
Deep Sleep - Sleep Paralysis
Quick-Play Spell
Target 1 "Deep Sleep" monster you control; this turn, if all monsters your opponent controls are in face-down Defense Position, it can attack directly, also during the End Phase, change it to face-down Defense Position. If a "Deep Sleep" monster(s) you control would be destroyed by battle or card effect, you can banish this card from your GY instead.
Deep Sleep - Goodnight Story
Quick-Play Spell
Target 1 "Deep Sleep" monster you control and 1 face-up monster your opponent controls; change both those targets to face-down Defense Position, and if you do, neither monster can change their battle position. During your turn, except turn it was sent to the GY: You can banish this card from your GY, then target 1 monster in face-down Defense Position you control; change it to face-up Attack or Defense Position.
Deep Sleep - Night Terror
Normal Trap
If you control no face-up monsters and your opponent controls a face-up monster: Target 1 Level 3 and 1 Level 6 "Deep Sleep" monster in your GY; Special Summon the first target in face-down Defense Position and return the second target to your hand. If you control "Deep Sleep - Dream Abyss", you can activate this card from your hand. You can only activate 1 "Deep Sleep - Night Terror" per turn.
Deep Sleep - Lucid Dreaming
Normal Trap
Reveal 1 "Deep Sleep" card in your hand, then target 1 face-down monster you control; change that target to face-up Attack or Defense Position, and if you do, it is unaffected by your opponent's card effects until the end of this turn. If you control "Deep Sleep - Lucid Dreaming", you can activate this card from your hand.
Deep Sleep - Nightmare Realm
Continuous Trap
This card's name becomes "Deep Sleep - Dream Abyss" while in your Spell & Trap Zone. During your opponent's Main or Battle Phase, you can: Immediately after this effect resolves, Tribute Summon 1 "Deep Sleep" monster from your hand in Attack Position. You can target 1 monster your control in face-down Defense Position; return that target to your hand, and if you do, Special Summon 1 "Deep Sleep" monster from your Deck. You can only use each effect of "Deep Sleep - Nightmare Realm" once per turn.