This test kit will reveal your HPA axis function. The HPA axis determines your body's physiologic response to stress. While you may not currently be under stress, stressful episodes earlier in life can cause the HPA axis to be over-reactive to stresses of any kind. With this test you'll see your Serotonin, Dopamine, GABA, norepinephrine, epinephrine, Glutamate, Cortisol (at 4 times of the day) and DHEA-s (at two different times). This can help reveal why you wake up in the middle of the night, for example.