“…We thank Tsai and Liu [ 1 ] for their letter on our paper [ 2 ]. It is an interesting suggestion to include secondary measures of differing “objective” sleep constructs, such as electrical activity in a polysomnography (PSG), serum melatonin, glucose, or movement; however, prospective monitoring of habits and perception is the key measured construct in sleep health, as well as the diagnosis and treatment of insomnia.…”