Abstract: A method of monitoring a patient to identify a sleep breathing disorder, comprising: a) Collecting, using a handheld monitoring device, a plurality of respiratory sounds of a patient using one or more sensors which are connected to the handheld monitoring device. b) Recording environment noise during the sleep session and averaging the environment noise to set an average noise level. c) Calculating a dynamic threshold according to the average noise level. d) Deriving a plurality of amplitudes from the plurality of respiratory sounds according to the dynamic threshold. e) Identifying a sleep breathing disorder event by analyzing a pattern of the plurality of amplitudes.