Automatic sleep radio timer

I would like there to be an option to set a timer for the sleep radio to turn on., I.e at 7:30 I would like it to switch to sleep radio or even shut off. My kids have a hard time falling asleep because they get to too invested in the story and don’t fall asleep. I know that I can shut it off from my phone. I’m sorry if this has been asked before, I’m new to this space.