Random Exhaustion

Does anyone else in their 3rd trimester, have 3 days of great energy and then wake up on the 4th day and feel like total crap!? I don't have any understanding. Like all weekend I felt great. A little sore but for the most part great. I wake up today and feel totally drained. Like I could sleep forever! I don't have the energy to do anything. I'm in a good mood and my mind saids get up and do something but as soon as I get up my body is like Nope! Rest! Can anyone else relate?