Systems and methods for monitoring baby's or partially disabled patient's level of thermal comfort during his/her rest in bed are provided. Preferably, the system comprises: a sensor of infrared (IR) radiation coupled to electric circuitry, the circuitry includes a transmitter of radio signal, and, as a separate unit, a receiver of this radio signal. The transmitter includes a circuit containing an alarm with an adjustable threshold that turns the alarm on whenever the heat flux radiated by the body of a patient or a baby rises above user-adjustable upper threshold value, or falls below lower threshold value. The system may be combined with a standard, advanced or video baby monitor.