Maybe he just shouldn't fly long-haul red-eyes.

There are primarily-daytime alternatives on pretty much every route out there, even if there are some where the overnight flights are the main options.

If you've got a flight leaving at say, 10AM or noon, and you're complaining about the light and not being able to sleep, it's particularly disingenuous. Even with a 12-hour long-haul, that's going to be primarily waking hours for someone on the local clock.