Healing is a marathon.

The thing about healing is like doing a marathon with your ability to focus on what you're suppose to be doing. I can roughly say that a 4hours of raiding for healers is like a marathon because the amount of focus you have to give is limitless.

Keeping people alive, not just 9 others. But then a 25man raid comes into mind it gets more tiring. Not to mention before the release of Burning Crusade, healers for 40mans raid are into the similar mental marathon over the space of 4-6 hours of raiding.

Is easy to lose focus if you're half asleep, at times I couldn't keep myself up if my tired. Talk about people who complains about playing other classes that does not heal. Maybe is just me, I like to keep people alive 1st myself later =P

My healing user interface at the moment. You should see it when I'm raiding =).