What kind of relationship is depicted in the following graph? 
Definitions:
Insomnia
A common sleep disorder characterized by trouble falling asleep, staying asleep, or getting restorative sleep, leading to daytime dysfunction and distress.
Unable
Lacking the ability, means, or opportunity to do something.
Sleep
A naturally recurring state of rest for the mind and body, characterized by altered consciousness, relatively inhibited sensory activity, and inhibition of nearly all voluntary muscles.
REM Sleep
A phase of sleep characterized by Rapid Eye Movement, during which the brain is highly active and dreams occur.
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