This image depicts the sleep cycles over the course of a typical night. In which stage does the brain become much more active, and heart rate, blood pressure, and respirations shift up and down, sometimes extremely? 
Definitions:
Corporate Stock Regulation
Rules and guidelines set by authorities governing the issuance, transfer, and trading of shares of a corporation.
Federal Government
The national government of a federal country that is responsible for areas of governance assigned to it by the constitution, distinct from state or provincial governments.
Bondholder
An individual or entity that holds the debt security issued by companies or governments, entitling them to receive the bond's face value plus interest.
Shareholder
An individual or organization that owns one or more shares of stock in a public or private corporation, thus holding a portion of the company's ownership.
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