This test evaluates the hormone and sleep connection. It is most interesting. It is a dried urine sample taken 4x during the day and is the industry standard for evaluating the sleep-wake cycle.
SLEEP Balance Home Testing Kit - ZRT Lab
Sleep,sleep, perchance to dream...It is interesting to note that the # of people with sleep disturbances is the same # of people with diabetes.
Could there be a connection? There is no influence more basic to all living things, plant and animal, then the hours of lightness and darkness. Melatonin and cortisol are like night and day, no pun intended.