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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<span>Persistent avoidance of social situations due to an intense fear of being negatively evaluated by others is most characteristic of: Social anxiety disorder
</span>Social anxiety disorder is a form of psychological problem that make people became discouraged to interact with other people.
On most cases, social anxiety disorder is caused by an immense fear of being unable to fulfill the expectation that required by a social group to be considered as a member of that group.
