Always Tired

There's a birthday celebration this afternoon but I don't feel like going. I feel tired even I did not do a lot of work last week. Tonight I am doing one night shift and then off for another two days. Husband just rang and said I need to go with them. He said I need to sleep now so that I can have a rest and then go to the party after kid's school. What? It's only 11:30 in the morning! Ok need to go now. Not to sleep but to clean the house ;(