There is something very purifying about ice baths. I woke up with too many different things my mind and when I sat down in the cold water I noticed how everything seemed to come into focus. I think there are two reasons: one, the sensation is so intense that it makes it hard to think about anything else. When you first slide in there is that jolt from the sudden cold, then after a few minutes you feel your body slowing down as the temperature really starts to settle in. Finally there is that burning sensation from the blood rushing back into your legs when you finish.
I've said before that ice baths were the only cure-all. I was speaking about helping with muscle soreness, but in my experience it even has a restorative effect on the psyche. It'is like restarting a computer, clearing the memory and beginning from scratch.