Humans have 5 stages ofor sleep, stages 1,2,3,4,5 . They don't really have specific names , but for example stages 1 and 2 are typically characterized as "light sleep" Stages 3 and 4 are "Middle sleep" and part of 4 and 5 are REM. Part two of your question is REM (Rapid Eye Movement) which occurs in stages 4-5.
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Checks and balances is the answer.
Bull market is the answer
The answer is a "Hermit".
A hermit is a man who lives alone and apart from society, for the most part for religious reasons. In Christianity, the term was initially connected to a Christian who carries on with the eremitic life out of a religious conviction, to be specific the Desert Theology of the Old Testament i.e., the 40 years meandering in the desert that was intended to cause a change in heart.