Teaching can be very stressful, and many teachers eventually suffer/experience 'burnout'.
the 'burnout' rate among teachers
a novel about academic 'burnouts'
(..) - What? I thought we were friends. What do you mean, you... - Playtime's over, okay? - Well, why you kickin' me out, Sean? I mean, what... I mean... You're lecturin' me on life? Look at you, you fuckin' burnout. - What winds your clock? - Workin' with you. Where's your soul mate? You wanna talk (..)1997 Good Will Hunting