No move would have an extra PP usage.
I checked this through a replay; no move looses an extra PP. This is because, you are using Sleep Talk as a move, which is used at Giratina with Pressure (bear in mind that Sleep talk is not directed at a Pokémon, you are using the move, and it would choose another random move from your moves except Sleep Talk if you are asleep).
You are using Sleep Talk as a direct move, which is choosing Scald as an indirect move, which would mean that no move looses double PP, as Scald came through a Sleep Talk, indirectly.
This can also be seen in the replay, Sleep Talk looses 1 PP, whereas Scald looses none, as it's used through Sleep Talk
Source: Experience + replay
Hope it helped!