"Sleep sex" will not be added to the game, as it is by its very definition, non-consensual.
In real life, that requires explicit CNC consent from a partner. I feel like since mind control is pretty extreme and goes against one’s consent, like at the start of the game you can choose to toggle on/off or whether you get a warning. I’m not the dev so I don’t have a say in whether this gets added in but it’s not the worst thing as far as kinks go. There’s nonconsenting groping and (I don’t want to spoil) a scenario where a sex tape can leak. Not to mention, the recent underwear stealing mechanic.
I’m not excusing any of this behavior in real life. But in the game, I would say somno isn’t the worse thing that can be added. If anything, it could even be limited to an exclusive action set for sub/dom dynamics in game. That’s another way!