I don't like them!
I don't like your colleagues! my mother always says: "ya gotta look out for number one".
Is it worth helping everyone else if you'e going to pay for it by being exhausted the entire weekend? It's your choice. Do what you have to do to do an excellent job, but take care of yourself, as it obviously affects your physical and mental health, but remember what mom says: ya gotta look out for #1.