There is nothing worse than starting your day off on the wrong foot. Yeah, sometimes it gets better, but it's my experience that when I get up on the wrong side of the bed, it's just all downhill from there.
For example, I went to a party a couple weekends ago and was holding a cup of water. I talk a lot with my hands and managed to slap my own cup of water out of my hand, and that was the least embarrassing thing I did that night.