The purpose of this study is to develop a wireless optical rhinometer for long term monitoring of the change in nasal mucosal perfusion. Allergen stimulation will lead to swelling of nasal mucosa and turbinate in patients with allergic rhinitis, and even cause nasal congestion. Cold induced nasal congestion often occurs in the morning right after awakening. To further study the changes in the nasal mucosa perfusion before and after waking up, a wearable wireless optical rhinometer was built for long term recording. This device measures the transmission of near-infrared through nasal bridge as an index of nasal mucosal blood perfusion. It also measures the respiratory air flow by putting thermistors at nostrils in order to confirm nasal congestion. An accelerometer was used to measure the head position during sleep to understand how it affects congestion, A microprocessor acquires these signals and transmits them to a smartphone through Bluetooth. The received data was stored in the memory card for further procession in a computer. The results of postural experiment, breathing experiment and sleep monitoring experiment showed that nasal perfusion change, with head position because of gravity. It also affected by the depth of breathing. The whole night recording during sleep confirmed that the system can successfully record all the signals without affecting sleep. This device will be helpful in future study of rhinitis.