Early morning riser - Someone who gets up so early that they might as well be a gh

Someone who gets up so early that they might as well be a ghost haunting the hallway at 5 a. m.

I'm that early morning riser who texts you at 5 a. m. to tell you your dog is dying.

He’s the early morning riser who eats cereal for dinner and calls it a day.

She’s an early morning riser. She’s been up since the clock was still in bed.