Hi there. I have the same exact cycling. I wake up normal, become hypomanic, manic then crash into depression within the course of a day.

The hypomania to mania switch lasts hours. The mania to depression switch takes five minutes. It can be very confusing.

The doctor said that this kind of cycling is most commonly caused by going unmedicated for too long. He also said that in some people the cycles shorten in duration and intensity as you age. I am 50 and haven't noticed any changes yet.

Hope this helps.