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Before you go to sleep, meditate and go into the Self. Then when you fall asleep, your whole sleep will be a meditation of staying in the Self.

The moment you wake up in the morning, again go into meditation for a few minutes and remain as the Self. Throughout the waking state, the undercurrent of remaining in the Self will be there even though you are working, arguing or quarreling.

This substratum will always keep you in the Self.

Sri Ramana Maharshi 

(Ramana Periya Puranam)