The people of Zembla believe that when you fall asleep you die: a different person will wake up, who will have inherited the body and most of the psychological traits of the person who fell asleep. What facts, if any, are the people of Zembla getting wrong?

The people of Zembla believe that when you fall asleep you die: a
different person will wake up, who will have inherited the body and
most of the psychological traits of the person who fell asleep. What
facts, if any, are the people of Zembla getting wrong?