Tired

I'm so tired today. Why is it that so many people can live on 4-6 hours of sleep. I seem to need almost 10 just to feel active through out the day. Listening to people complain all day seems to be dragging me down even more - not like it doesn't already. But, this seems to be overwhelming. People just can't seem to think past their own thought I realize that everyone is human and is capable of a bad day. Today the person who I relieve at work became overly cranky with me because of her own problems with the job. I can't hate her for taking it out on me, but it sure does get old when all you do it listen to complaint.