When activating "Do not Disturb" on the phone it has the option to hide visual notifications while the screen is off. Textra still will light up the screen with a notification even with changing the notification settings in the app itself to only wake up screen Yes (except on silent)

I'd suggest a way that when Do not disturb is activated on the phone itself Textra will either recognize that this is considered setting the phone to "silent" and will not wake the screen up.