Thanks for the post.
Can you provide us with more information about the issue you are experiencing? How do you know that the Roku mobile app is turning on your TV during the night?
With more information we will be able to assist you further.
Thanks,
Danny
This one is strange, haven't seen such things, are you sure it is due to Roku remote if yes try disabling it for a day and see if tv still gets turn on.
Regards,
Tristan Leroy