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You never enter restful rapid eye movement sleep, since you have spent the night basically holding your breath.

In recent years, many researchers have argued that mammals’ elaborate sleep cycles—which include deep sleep and rapid eye movement sleep—are important for memory consolidation and removal of toxins from the brain.

Built-in artificial intelligence analyzes the data on the fly, identifying whether a person is, for example, in rapid eye movement sleep or other known stages like nonrapid eye movement sleep, which are not as deep.

They tend to linger in the deepest phases of sleep for less time than younger adults, and they get less rapid eye movement sleep, too.

Participants spent longer in “deep sleep”– known technically as stage three non–rapid eye movement sleep – and experienced fewer disruptions to this sleep when rocked.