The man, David Charlesworth, a teacher at Rosset school is currently in Pinderfields Hospital with life threatening injuries.
There are no suspicious circumstances surrounding the incident.
Pupils from the school attented a special assembly this morning (12 May 2011) were they were told about the incident.
Pat Hunter, Head Teacher of Rossett School, said: “We are all naturally shocked and upset by what happened in the early hours of Wednesday, and our thoughts are with David and his family.
“David is an excellent teacher, very well liked by both staff and students, and we are all devastated by what has occurred.”
North Yorkshire County Council’s Children’s and Young People’s Service is in contact with the school to ensure that any advice or support which may be needed is readily available.