In deep sleep we are dipped into utter silence, it rejuvenates us; the world does not enter there. Only silence. If you truly want to feel the non-dependent happiness then you have to practice meditation that alone can take you to that wordless silent center of your Being which is also the library of infinite wisdom not just intellectual knowledge. There you will meet your Self, your Guru, your God. Now you will no longer desire anything. Everything will happen. You will remain witness. Ever happy and cheerful. That is enlightenment. The Wise say, “You are That”! 
Bodhi Shuddhaanandaa