This is something I've been interested in when looking at the overall patterns of my life. My thought is that my hypomania caused depression due to the trouble I was getting in. The hypomania was either seasonal or triggered by events that were overstimulating (moving to California for example). But I can also say that depression has slammed me for no reason at all. My last bout came shortly after I had just received very high accolades for my work (on a multi-national scale).. so I should have been stoked. I had also just returned from a show that went really well. I may have been hypo during the time leading up to the show and during. I sure crashed hard afterwards. I remember coming in from the shop in tears telling my wife that the depression had just hit.