**6. Conclusion**

Recently the field of chronobiology attracted many researchers all over the world toward Circaseptan cycle (seven-day weekly cycle). It is commonly noticed in most of the plants, insects, and animals other than humans possessing weekly cycles. Apart from being the key coordinating rhythm for many rhythmic activity in body, seven-day cycle has been found in blood pressure fluctuations, variation in blood acid content, heartbeat, red blood cells, urine chemistry and volume, oral temperature, the ratio between two important neurotransmitters, female breast temperature, norepinephrine and epinephrine, and the rise and fall of several body chemicals such as cortisol, the stress coping hormone.

The research in biological rhythms attracted many scientists especially in the field of chronotherapy, the application of biological rhythm to therapeutic procedures may be achieved by synchronizing drug concentration in drug delivery system with rhythms in disease activity that will improve the healing nature [35]. Furthermore research on this nasal cycle may pave a way for a new diagnostic and therapeutic technique in the medical field. A data base can be maintained for various diseases based on airflow pattern, which can be utilized by the researchers to train the neural network-based disease classification.
