For, unlike mere insomnia, lying awake at night in the woods is pleasant. The eager, nervous straining for sleep gives way to a delicious indifference. You do not care. Your mind is cradled in an exquisite poppy-suspension of judgment and of thought. Impressions slip vaguely into your consciousness and as vaguely out again. Sometimes they stand stark and naked for your inspection; sometimes they lose themselves in the mist of half-sleep. Always they lay soft velvet fingers on the drowsy imagination, so that in their caressing you feel the vaster spaces from which they have come. Peaceful brooding your faculties receive. Hearing, sight, smell—all are preternaturally keen to whatever of sound and sight and woods perfume is abroad through the night; and yet at the same time active appreciation dozes, so these things lie on it sweet and cloying like fallen rose-leaves.
In such circumstance you will hear what the voyageurs call the voices of the rapids. Many people never hear them at all. They speak very soft and low and distinct beneath the steady roar and dashing, beneath even the lesser tinklings and gurglings whose quality superimposes them over the louder sounds.

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