Traveling from one time zone to another is tough. There's a strong possibility you'll arrive with jet lag. And anyone who has traveled knows how difficult that is. It feels like you haven't slept for days.
Jet lag is a common side effect of traveling that is caused by a disrupted circadian clock, or the "internal clock" that keeps everyone on a day-night cycle.
But now there's an app that helps you trick your body into thinking it's on a different time zone. The Entrain app was developed by the University of Michigan, and simulates your circadian clock using your phone's light settings.
It works by setting a "light schedule" for the traveler. This schedule then uses mathematically optimal lighting recommendations to help them adjust as fast as possible to new time zones and schedules.
The goal of Entrain is to help you reset your "internal clock" to new time zones quickly. Tests have demonstrated that travelers who used the app started sleeping better and adjusting more easily to the new time zone.
If you can't follow the recommended light schedule, the app's settings can be updated to adjust your preferences. This allows you to be in control of the pace you go through the schedule.