Being a primary school teacher is not easy. Kids are demanding, dependant creatures. They can't do anything without help and if you even try to 'turn off' they will call you out in a heartbeat.
Home offers very little comfort for a weary teacher: being my girlfriend is not easy either. I'm a demanding, dependant creature. I can't do anything by myself and if someone doesn't feed me I'd die.
Yep, for some people life is a 24 hour day work.