The physiologic change most likely to lead to an increase in intracranial pressure is

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Cerebral vasodilation leads to an increase in blood flow to the brain, which can increase intracranial pressure. Hypernatremia (high sodium levels) can cause an osmotic shift of fluids from the brain into the bloodstream and can actually decrease intracranial pressure. Respiratory hyperventilation can temporarily decrease intracranial pressure by causing vasoconstriction in the brain. Sleep may actually decrease intracranial pressure as well, as there is a decrease in metabolic activity in the brain during sleep.

The Physiologic Change Most Likely to Lead to an Increase