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3.
A time in the morning that most people consider way too early to be awake. 5am is normal early; anytime before that is stupid early. It's most often used to describe waking up in the morning so it wouldn't apply to staying up late at night into the next day.
"Are you going hiking with Mark tomorrow?"

"No way! He's getting up stupid early to watch the sunrise."
by Kyle Freeman June 19, 2008
 
1.
A time in the morning that most people consider way too early to be awake. 5am is normal early; anytime before that is stupid early. It's most often used to describe waking up in the morning so it wouldn't apply to staying up late at night into the next day.
"Are you going hiking with Mark tomorrow?"

"No way! He's getting up stupid early to watch the sunrise."
by Kyle Freeman June 19, 2008
 
2.
Stupid Early is any time in the morning, when you don't feel you should be awake. It is too early for you, and you hate being awake and active at this time. Any time before 8AM can be universally classed as Stupid Early. If your boss asks you to get to work for 7AM for example, you can say 'That's stupid early'
I'll be there quite early tomorrow, but not stupid early.
by Eric Booth November 14, 2010