Help! Alarm function

We recently found need for the alarm function to ward off nighttime rodents. We were so excited to see the light/sound function built in to use but now I’m just irritated. How can you have an alarm function that reacts to motion that you can’t schedule? Once it’s on, it’s on and this morning scared away the birds….help? Is there a way to schedule for nighttime that we are missing? Otherwise, what’s the point of an alarm on a bird camera?