Some birds have also demonstrated the capacity to fall into slow-wave sleep one hemisphere of the brain at a time.
"What about the release of human growth enzyme in such large concentrations during slow-wave sleep?"
The first two hours of the night were spent in deep, slow-wave sleep.
Members of a second group were awakened every time they entered slow-wave sleep, a stage when dreams tend not to occur.
"That's because they have lots of what we call deep, slow-wave sleep."
Children and young adults will have more total slow-wave sleep in a night than older adults.
The elderly may not go into slow-wave sleep at all during many nights of sleep.
The two species produce, during part of the night, low-frequency electrical activity known as slow-wave sleep.
After roughly 10-30 minutes, the brain enters into slow-wave sleep.
But the sleeping pattern was different: the first four or five hours were deep, slow-wave sleep.
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