Why Are People Happy in Hospital After An Accident?

I've been in hospital overseas with multiple injuries and you are happy because
a) Morphine. Or another pain reliever keeps you high or in high spirits.
b) Progress. You see progress and improvement daily with a physical injury which is mending. You start on your back being groggy, sit, stand, and you are constantly getting better. So the input and reaction is that you are achieving something every day.
c) Company. You are never alone in hospital because you are with other people or even if in a side room you are visited every fifteen minutes.
d) Cheerfulness. Happiness is catching and you are treated by a cheerful nurse and a doctor who has a bedside manner and visitors bringing flowers or gifts .
e) Attention. You are the centre of attention. Doctors, nurses and visitors - their only interest is listening to you, your news, news about your situation, and giving you attention.
f) Effortless. Your food comes to you. No need to do anything or go anywhere.