Happy, then irritable

Today I had more energy than I've had in a while. I did my work very fast and had no problems getting stuff done at home. Even though I was super busy at work I was still in a good mood and didn't feel overwhelmed at all. That is, until I took a nap. I slept for about an hour and a half and had five and a half hours of sleep last night. My head felt fuzzy and thick after my nap, my coordination was off and I was irritable. I'm still tired and would like to go to bed. And I'm getting more and more irritable as the evening progresses. Now I'm wondering if I should have skipped the nap in the afternoon. Of course, this is the wrong week to be judging how much sleep I need, I can never get enough when Mother Nature visits.