They learnt to avoid this by not going into sleep , but eventually ____, supporting the Restoration theory.

Other evidence from animals show that the amount of REM is ____________ the maturity of the animals.

For example Dolphins have no REM sleep at birth as they have more brain development since they are able to ____ straight away.

A study that does not support this was done by Horne and Harely, who believed that it is because of the ___________of the brain that is why we sleep.

They did a study using __________ and found that 4 out of 6 of the participants had longer periods of slow wave sleep after.

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