Oddly timed fatigue

Hello. I am curious if anyone out there has oddly timed fatigue. For example, I work full time and during work, I struggle to keep my eyes open. When I get home, I am still very sleepy until about 7:30/8pm and then out of NOWHERE I am full of energy and get every chore done imaginable within an hours time. Super wired and in high gear. I am only 5 weeks 2 days pregnant but I'm getting irritated with the fatigue/energy pattern. Any tips on shifting my energy back to the day time?