What Causes Extreme Sleepiness And Tiredness In A 55 Year Old Person?

I am a 55 year old woman soon to be 56, and I m always tired and I sleep more than usual. I used to sleep about 5 or 6 hours at night, now I fall asleep when I come home from work and sleep for 8 hours, get up to make my lunch and sleep until morning. Trying to understand what s happening to me. I used to hear every noise in the house while I m asleep. Now I hear nothing until my son is standing in front of me saying mom. What is going on?