@philippe I have an idea that You can turn off your device and your plane will continue to fly.
Eg Let's say you start a flight from SYD to LAX at 8pm. You have a flight plan and then you put the plane on route to LAX. You turn off your IPad and then, at 10am the following day a nofication will appear that the plane is nearing the Destination. You turn on your IPad and you land the plane.
This will stop the urge to be up for 14hrs staring at a screen.
If ATC gives you a Vector and the IPad is off, the A/P will just follow what ATC said and reply.