Booking an early start
An early-morning duty needs advance arrangement, so request it well before the day instead of the night before when you can. Share the reporting time, the pickup address and whether the trip is for an airport, a station or an office.
For an early flight, work back from the airline's reporting time rather than the departure time. For a train, share the train number so the pickup time can be reviewed.
Keep your phone reachable at pickup. A driver arriving before dawn may need directions to the exact gate of a large housing society.