**Acknowledgements**

With regard to the ASSM 2007 criteria on the definition of hypopnea, this author has enjoyed his communication with Chen-Liang Lin, PhD, Department of Mechanical & Electro-Medical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan. Thanks are due to Professor Anna Wirz-Justice, President of Society for Light Treatment and Biological Rhythms, and Professor of Psychiatry, University of Basel, Switzerland, for her courtesy and cooperation in exchanging research experiences with this author. Thanks are also due to Dr Yemeng Chen, President of New York College of Traditional Chinese, Medicine, Mineola, New York, USA. Dr So-Jen, Kuo, President of Changhua Christian Medical Center,Taiwan, and, Professor Sui- Tien Chen, Director of Systemic Biological Laboratory, Institute of Biological Chemistry, Academia Sinica, Taiwan for their respective encouragements. The author, (B. Tang) has been so grateful to his eldest son. Jack Tang, B.S. for his technical support.
