Sheets were provided. I don't remember whether there was an extra pillow for it or we just used pillows we had in the car from the trip down.
Probably depends on the room set-up but the trundle in ours was the closest bed to the air conditioner and the 'trundle' is basically on the floor so it was a chilly place to sleep. We had a blanket in the car we brought in so it was fine.
I'm sure the hotel would send out an extra blanket or pillow if needed, also.