I don’t see why it’s any different with Keeper and Roots though. Roots even does damage, so is it not considered OP?
The difference only comes from ghouls being more swarmy than hunts, otherwise the effect is generally the same. The only difference is sleep is easier to break, making ghoul surround an unreliable tactic vs pro play.
Horde can also swarm with TC/Grunt/Raider combo which is very strong and viable. Swarming is definitely a tactic, and it’s something that’s easily countered with strong AoE too. The problem with Sleep as a spell is that on pro level, it’s very easy to break and disrupt. It honestly makes ghoul swarm tactic require more work than it should.
The threshold shouldn’t be so powerful in T1, that’s why I suggested 10hp, enough for a Hero to wake but not so easy that 1 archer shot will wake up a unit. By level 3 Sleep, 50 HP threshold makes it a fair disable. On the level of Entangling Roots or Ensnare.