Sports in the morning

So here’s a rather disappointing thing I learned about myself recently:
Attempting to do medium to hard cardio efforts cycling or running in the morning with a total calorie expenditure of 1,000+ will leave me tired all day and cause me to have to drink more coffee or strong tea than usual to stay awake and concentrated.
Doing a longer and hard set of high intensity interval training (bodyweight or with weights) between 500 to 1,200 calories will leave me physically exhausted and my muscles burning but awake and refreshed.
I consider this unfortunate because I love cycling in the mornings, setting out right before sunrise and cycling somewhere interesting.

Alex Hoffmann @mangochutney