Ibn Hazm says:

212. To distance ourselves from the vanities of the world it should suffice to remember that every night every man alive, in his sleep, forgets everything that worried him during the day, all his fears, all his hopes. He no longer remembers his children or his parents, glory or obscurity, high social responsibilities or unemployment, poverty or riches, nor catastrophes. Such a lesson should be sufficient for a thoughtful person.

Notes:

• Sleep is death. It kills off most problems you stress about. When you awake, only the more pressing problems remain. Sleep itself is a blessing - let that not be forgotten. Thank Allah for it, lest He takes it away from you.

Trust me on this one. I haven't been able to sleep for three days.