At the onset of REM sleep, the rat would either fall into the water only to clamber back to its pot to avoid drowning, or its nose would become submerged into the water Acute stress reaction | shocking it back to an awakened state. In the U. S., the numbers of rats and mice used is estimated at 20 million a year.

At the onset of REM sleep, the rat would either fall into the water only to clamber back to its pot to avoid drowning, or its nose would become submerged into the water Acute stress reaction | shocking it back to an awakened state.

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