When I’m up I have more energy, can function better and this leads to accomplishing a lot which leads to euphoric mood. When I’m down I have low energy which causes me to function and accomplishing less and that leads to feelings of worthlessness and helplessness and hopelessness. Also when I’m up but not manic my memory , concentration and focus are better than when down. So it’s a cycle and for me a seasonal bipolar 1 cycle