This is a question our team has been asked on more than one occasion. The better question, however, is what is the reason you wish to set up scheduled reboots? Are you having an issue with your players that is only fixed by rebooting? If so, the best thing to do is open a support ticket with our team and work with us on troubleshooting the issue and finding the root cause. This is not the short and quick fix you are looking for, but this is how we find problems and fix them so they don't become chronic issues for you. We will always prefer to resolve the core issue which will contribute to future stability.
Aside from this, there are other reasons as well of why this is not a good idea:
1) Very frequent rebooting can cause more harm than good, as this is a very taxing process contributing to additional wear and tear on your player.
2) The boot process is very sensitive, and if for some reason your player gets stuck during this stage it could very likely require additional manual action (e.g. needing to re-flash your player, etc).
That said, we are not saying that an occasional reboot is a bad thing. If you find yourself needing to reboot infrequently, then by all means go ahead. When it becomes a problem is when you find yourself doing this frequently and/or in a pattern to fix an issue.