I do have some mild depression, i wont get into a lot of detail as to the why, it involves someone in the family dying. Generally i got a watch and it shows my saturation levels dropping to low 70s at night and my respiration dropping to 8. I tend to wake up either exhausted or really groggy and confused. Maybe i should go see a doctor ... My belief was always that depressions and mnetal disorders were not physically manifestable, they live in the brain. But on reflection, it would make sense one affects the other