When Flair Room Sense is activated, you will also have the option to set Quiet Hours. Quiet Hours are located in the IR Device settings. Go to Home Settings->IR Devices, expand the IR device, and set the Quiet Hours for that device. Quiet Hours are set on a per-device basis.
During Quiet Hours, Flair will not regulate the temperature. You may want to set Quiet Hours in the evening, or during nap time.