What is the Role of Abscisic Acid

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This will be my least controversial claim.

ABA is clearly released under various stresses, such as water shortage,
and salt damage.

Scientists have noticed that ABA levels usually don't stay elevated
after some trauma or preceding winter hibernation, rather they rise for
a period and then fall presumably after having their effect.

ABA closes stomates preventing water loss and are also part of the
wound response.

My speculation is that ABA is the depression/sleep hormone of plants.
It causes plant metabolism to basically suspend and for the plant to
hunker down or batten down its hatches until the current environmental
stress has passed.