Sleep is one of (a) — most important factors (b) — human life. (c) — sound man cannot go (d) — sleeping. Sleep is (e) — healing medicine of the troubled (f) —. It relieves physical and mental pain. Night is the proper time of (g) —. But if (h) — man has to pass a sleepless night, he never feels well. He loses energy and peace of mind. As a result, he becomes indifferent (i) — his (j) — and responsibilities.