As the sleep cycles continue, the proportion of rem sleep in each cycle decreases. true or false

A sleep cycle progresses through the stages of non-REM sleep from light to deep sleep, then reverse back from deep sleep to light sleep, ending with time in REM sleep before starting over in light sleep again.

The statement that as the sleep cycles continue, the proportion of REM (Rapid Eye Movement) sleep in each cycle decreases is false. The sleep cycle has five stages: stages 1-4 and the REM (rapid eye motion) sleep stage.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.