Starlight Cradle Update 2
This update adds more levels, enemies, and weapons to the old, but new sleep status.
Levels
Starlight Cradle: Dreamy Woods l will introduce Sleep construct and Sleep beasts. The start of the level will be a wide open plain with 3 branching paths and another path that has 3 locked gates leading to the elevator. You will go down the paths in any order you choose to retrieve the 3 keys. The end of each path will feature an arena where you fight a mixture of beasts and construct. Each arena will reward you with 5 crates and 2 crystals.
Starlight Cradle: Dreamy Woods ll will use the same enemy pallet as Dreamy Woods l. This level, unlike Dreamy Woods l, won't be linear. This level will have wide-open fields with crates and enemies scattered around. To reach the elevator you must find the statue and place it on the pedestal. The statue can be in one of 4 places.
Starlight Cradle: Rude Awakening l. This level will introduce Sleep undead and pair them with the slooms. You'll be adventuring through a forest similar to that of the snarbolax with a mysterious fog over it. There will be bones scattered around the trail in which the new sleep zombies will awaken from. This level will have only 1 arena where it throws combinations of various sleep undead and slooms at you.
Starlight Cradle: Rude Awakening ll . This level uses the same enemy pallet. This level will feature lots of gravestones and thus lots of sleep undead. There won't be any arenas here. Just branching paths where you can find crates and such.
New Equipment
Tranquilizer: This is a a New path of the autogun line. It does elemental damage and the moderate sleep status. It's perfect for launching a barrage of bullets. Putting all the targets it hits to sleep and then charging up for another burst. 3* Sleepy Shot to 4* Restful Needle to 5* Tranquilizer.
Sleepy Thorn Blade: This is new path of the snarble barb line. It will do Piercing damage and moderate Sleep status. Throw a spread of thorns at your enemies which all have a chance of inflicting sleep. Your 2nd and 3rd normal hits have a chance to inflict sleep too. 3* Twisted Sleep Blade to 4* Dark Sleep Blade to 5* Sleepy Thorn Blade.

What if they made sleep variations for the basic enemies (the ones that have status versions) and added sleep as a generic clockwork tunnel theme?

Ok so, I don't wanna seem like no fun but I think that not having sleep spread around as much as other status is a good idea. Sleep and curse are both very dangerous and rare statuses that very few armor sets protect from and a lot of armor sets have a penalty against. Sure I'd like a new monster preferably a beast and maybe a new area too but I don't like the idea of it being treated as the other statuses because it's so unique and different from them.
Sleep-Gun, new gun-types.
Either a grenade launcher, that spawns small haze fields at range.
> Grenade can ricochet off walls and detonates if it has contact with a mob or loses all of its speed.
Or a mid-range flamethrower, that emits sleep gas instead of fire!
I see a sleep gun more as a single target weapon with piercing damage and long reach. Magnus style with a different charge. Narrower projectile, hits only once but hits like a truck. It should have a good chance of dealing strong sleep status. It won't be overpowered since it can only target one or at max two targets at the same time because of its narrow bullets. For a sword, just add sleep to the current amputator.