What pattern of curved arrow pushing is the fourth step of this reaction? 
Definitions:
Circadian Rhythm
Our biological clock; regular bodily rhythms (for example, of temperature and wakefulness) that occur on a 24-hour cycle.
REM Rebound
The tendency for REM sleep to increase following REM sleep deprivation.
Sequential Processing
A method of information processing where data is analyzed in a linear, step-by-step manner, often contrasted with parallel processing.
Cursive
A style of penmanship where characters are written in a flowing manner, typically for the purpose of making writing faster.
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