Rank the following compounds in decreasing order of water solubility (highest to lowest) . 
Definitions:
Stage 4
This term is too vague without context; in various models, it could refer to different levels or phases of development, illness, sleep, etc.
Sleep Stage
A period during sleep characterized by specific brain activity patterns and physiological changes.
Non-REM Sleep
A state of sleep that includes all sleep stages except for REM (rapid eye movement) sleep, characterized by slower brain waves and reduced brain activity.
Night Terrors
A sleep disorder causing feelings of panic or dread, typically occurring in children during non-REM sleep.
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