Can ring trigger alarm only if a person is detected in midnight?

Hi @user32281. Ring Cameras and Doorbells cannot trigger the Ring Alarm or the siren on the Security Cameras. This is to prevent unwanted and disruptive sirens or alarms from going off. If you have the Ring Alarm system and a Ring Security Camera, you can link them together so that the sirens on the Cameras will play when the Ring Alarm is triggered.