I am a morning person.
I usually wake up early in the morning (except for holidays and weekends) during study sessions so I could prepare myself for the whole day.
My mood for the whole day depends on my morning.
If I happen to wake up late, I'd be pretty pissed off for the whole day. Because I feel like I've missed precious hours of my life which I could do better things besides dreaming.
If I was trapped in a traffic jam while driving in the morning, this will further worsen my mood. Then I'd be a pain in the ass to everyone for the whole day.
Unless something else comes up and I feel better - like a hot guy smiling to me. Haha :P