Exhausted !!!!

I’m on my 3rd day out of 5 days of period cycle. I’ve never been so sleepy in my life during my period. I’ve taken like 4 naps today, and I’m talking like an hour long each! My cycle is heavy from day 1 until the very last day so maybe that could be it? Idk tbh but I️ just woke up from an hour and 30 nap and still sleepy. Anyone experience this 😫