I can be either or both, or take naps between long sleeps. One thing that I am _not_ is a "lark" -- I'm not energetic and cheerful for at least a couple of hours after I'm out of the bed (even from a nap), and after I've had my coffee in quietness. But that is so whatever time of day or night it might be. If anything happens to irritate me during that couple of hours, though, I'm a volcano, and you don't want to be around me, so I guess you could say I'm energetic in that way, but it's not a good form of energy.
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Asperges me, Domine