I think it’s b, but I am not sure
Sounds like depression. It could also be anxiety, though. You'd need more details to accurately diagnose anything.
They are emotions that happen due to the release of hormones into your bloodstream. They change the way you behave and are consequences of other events. They can give you a different outlook on life.
The best time would be right after you wake up. But, some fmedical watches can record it while you sleep, so that is even better.
Walter Camp, (April 7, 1859 – March 14, 1925) was an American football player, coach, and sports writer known as the "Father of American Football".