What is a good way to decribe an episode of hypomania to a boyfriend?

LOTS OF ENERGY!!! Out of nowhere, and for no apparent reason, a rush of energy and motivation accompanied by a ridiculously good mood (again, for no apparent reason) that lasts 4 days or longer. Sometimes people get a little "full of themselves, " talk a lot (and fast), are filled with great new ideas, and embark on overly ambitious projects. Little sleep is required. Behavior can become risky and impulsive.