C.R.
My son has his adenoids removed and tubes put in his ears a year ago. He was very confused coming out of surgery and was quite sleepy the rest of the day. He had to take a drink before we could go home and that was a challenge. As soon as I got him home he pretty much slept all day waking up two times for like an hour and then still slept all night. I think the anesthesia was really tough on him.
His neck was sore for about a week, but our ENT said that was normal as they really have to pull the head way back to reach the adenoids. We just kepted him does on ibuprofen.
Good luck!