"Sometimes, in a summer morning, having taken my accustomed bath, I sat in my sunny doorway from sunrise to noon, rapt in revery, amidst the pines and hickories and sumachs, while the birds sang or flitted noiseless through the house until by sun falling in at my west window, or the noise of some traveller' s wagon on the distant highway, I was reminded of the lapse of time. I grew in those seasons like corn in the night, and they were far better than any of the work of the hands would have been. They were not time subtracted from my life, but so much over and above my usual allowance. I realized what the Orientals mean by contemplation and the forsaking of works."
Walden
Deny children -- or anyone else -- the chance to do "nothing," and we may be denying them the chance to do "something" -- to find and do any work that is truly important to themselves or to someone else.
"The time to relax is when you don't have time for it."
"Take rest; a field that has rested gives a bountiful crop."
And he [the Lord] said, Go forth, and stand upon the mount before the Lord. And, behold, the Lord passed by, and a great and strong wind rent the mountains, and brake in pieces the rocks before the Lord; but the Lord was not in the wind: and after the wind and earthquake; but the Lord was not in the earthquake:
And after the earthquake a fire; but the Lord was not in the fire: and after the fire a still small voice.
The Innocents Abroad