Just got off my period but .....

Ok so I officially got of my period Saturday but me and my husband been sexually active since Thursday/ Friday and Saturday but I notice and so as he ..I been Extremely tired yesterday I slept all day soon as I got off work I slept got up for about an hour went back to sleep eat something and went back to sleep ... he keep asking me why am I soo sleepy idk my body is just tired I guess n now that I slept all day I had to be at work this morning n the crazy part I still was tired and even had to take an energy drink .... was up with that