A gradual shift can help, but several photographers find it more effective to flip the schedule quickly: stay awake late or even through the night before your first overnight session, then sleep during the day to reset your body clock.

To get through the nights without coffee, use a mix of tactics:

• take a solid nap or afternoon sleep before shooting
• eat small snacks through the night
• stay physically active when possible
• use music if it helps you stay alert
• if tolerated better than coffee, try something mild like green tea or peppermint

For daytime sleep in a hotel, earplugs are one of the most useful tools, since daytime noise is often the biggest problem.

Also think about eye comfort during repeated night shoots: carry eye drops, and use a red light instead of a bright white flashlight to reduce eye strain and preserve night vision.

After the trip, shift back gradually over several days if you can. The key is protecting your daytime sleep so you can recover between sessions.