Guess what's really tiring...
to act sane all the time!!!
And yes, sometimes it really is "acting", this listening to mind, applying thought, doing the 'correct' justifiable thing, being sensible process...because the heart wants to be crazy once in a while, act, think, feel, crib, cry without catering to reason.

The toughest time in life is probably when you sit with people with whom you shared a beautiful relationship, with whom you had never ending conversations blurting out almost everything and you have nothing to say! When suddenly you feel scarcity of words. When the song at media player breaks the silence. You don't have courage to look into their eyes neither do they have. Inspite of sitting next to them you can feel the thousand mile distance in between. Sitting numb just looking at watch. Thanks to cell phone they occasionally give you an excuse to take a break. With artificial smiles on face everyone around is smiling for no reason.
In the end on a more practical note,

If you don't like something change it; if you can't change it, change the way you think about it. :(