I once stayed mostly hypo for months on end. That's how some people met me and just thought hat I'm always the life of the party, the eternal optimist and the most joyful, understanding person ever. Depression crept in slowly and it least didn't come with a bang.
It's like the pendulum swings - the higher to one side, the same to the other side. Isn't that just what we all want, for the pendulum to have a small swing?