Waking up early and doing a workout for an hour or two helps me to sleep very well for next 3-4 hours after the workout -- or keeps me sleepy for half the day.

Waking up early and doing a workout for an hour or two helps me to sleep very well for next 3-4 hours after the workout -- or keeps me sleepy for half the day. Works totally differently in the evening. Brain just goes at double speed after an evening workout.