Wishing him a good recovery, Stephen.
When my mom was in the hospital une general A, she was feeling post- A confusion a bit, more at times especially after wakng up, several days in.
A whiteboard helped us : where she was, specifically when she would see me next ( between 8-10a, not earlier than 11am) and a message to call anytime with my phone number (for an aide/ therapist to dial on the land line). Fwiw.