A 16-year-old boy suffered memory loss when he awoke from a nap at school in Shenyang, Liaoning Province last week.

Jin, a Grade 3 middle-school student, woke from a post-lunch nap on his desk believing he was a 12-year-old primary student. He didn't recognize his classmates and had no recollection of the past four years.

Doctors recommended psychological counselling and said Jin may be suffering from depression and anxiety in the lead-up to exams.