OK can someone tell me why Corvo doesn't warn Calista to get Emily to safety when he knows he's been drugged? It is pretty obvious that he's been set up to pave the way for Farley, Martin and Treavor to take power and influence Emily to do their bidding. With Corvo out of the way they can influence her but with Corvo around, they would not be able to.

Cecilia has a safe place so, in his position, I would speak to Cecilia quietly and then ask Calista quietly to make an excuse, such as, Emily is tired and needs some sleep, then go with Emily to the safe house with Cecilia and stay there until I come for them.

Has anyone else wondered why he just goes to bed without saying a word?

He doesn't know it, he just feel a bit ill and think he need to rest a bit. At least, that's my impression of it