Extremely fatigued after ovulation?

Has anyone else felt extremely fatigued after ovulation? My ovulation happened sometime between Aug 25-28 and I have been falling asleep every few hours and taking like 2 hour naps. I never take naps. Last night I went to bed at like 10pm when I usually have trouble falling asleep anytime before 1am, and this was after taking an hour nap around 7pm last night. I don't have a fever or any other symptoms of possibly being sick. It is way too early to take a test but I feel like I've been run over by a truck. Does anyone know why I'd be this tired after ovulation?