Sleep should (by 5e rules) result in an auto-crit, since the targets become unconscious. I don't believe the same is true for Tasha's Hideous Laughter.
Yeah sleep causes you to be incapacitated by sleepnso each hit is an automatic crit.
Tashas laughter just causes you to go prone. Melee hits gain advantage and ranged hits should get disadvantage (last part isent in bg3. Ranged attacks also get advantage against prone targets.)
