Why should you ? The moment you are in sadness, your emotion are at the weakest. You are not capable to think straight and will easily get so emotional. That is why sometimes, when people are sad they can get really mad or unconscious. In the mean time, I am always at the weakest point of my emotions. Sadness come and go without hesitation. I can't even think what should I do, the problem keep hanging in my mind and there is no way out. The emotion get so unstable until sometimes it can go out of control. I sit up straight, take a deep breath and start to selawat. I can do no more, the best is only to pray to Allah s.w.t and believe in Him.