Can Aegislash change forms in sleep?

Question

It happened on Pokemon showdown when it was going to use kings shield, it successfully changed forms but it said it was fast asleep. Does this happen in the real games?

Answer 1

>If selected by an Aegislash with Stance Change while in Blade Forme, it will change to Shield Forme immediately before it would use King's Shield, even if the move fails or is not used due to something like sleep.

Yes, Aegislash can change forms while asleep, and it does happen in the games.

Source