PRE-PERIOD AND OVER SLEEPING

Vee
Hello! 
So I've been really curious as to if I'm the only one experiencing exteme fatigue 1-2 days before my period hits. 
I'm usually pretty determined to go to the gym and follow a balanced diet but when it's 1-2 days before my period I.... Over eat, over sleep, become too tired to go to the gym and end up sleeping again. 
Does anyone else experience this? Is there an explanation? And how do you cope with it? 
Thanks! Xoxo