I'm a night owl with a slipping sleeping schedule, but the psychiatrist seems to have a point about depression: there seems to be a link between perceived light

I'm a night owl with a slipping sleeping schedule, but the psychiatrist seems to have a point about depression: there seems to be a link between perceived light, circadian clock and depression. Which is not exactly pointing a finger at all night owls, but at least to people with slipping schedules like me.