Most Helpful Guy
An EMT paramedic is a stressful job, chances are he's so tired at the end of shifts he just wants to go to sleep. It's nothing against you, it's the fact that he has such a stressful job he needs all the sleep he can get.
Put yourself in his shoes, very high intensity and stress for hours on end with no break, wouldn't you just want to sleep? Also being tired as an EMT paramedic could lead to a mistake which could lead to damage to someone which could lead to being sued for everything he has plus extra.
So I reckon it's nothing against you, it's just that he's super tired and needs rest1