Benign paroxysmal positional vertigo is the most common vertigo due to precise head position changes. It is the cause of the sudden spinning sensation and is characterized by brief periods of slight to severe dizziness. It is because the crystals seen in the otolith organs are dislodged. In that case, they move into the semicircular canals in the inner ear, which are sensitive to the changes in head position, causing dizziness.
Geriatric Benign Paroxysmal Positional Vertigo
Benign paroxysmal positional vertigo is a problem of the inner ear that can result in a false sensation of movement or spinning.
Vertigo: Symptoms, Causes and Treatment
Vertigo is a feeling of off-balance or sensation of dizziness. A variety of conditions causes it. The below article details the same.

Benign Paroxysmal Positional Vertigo - Causes, Symptoms, Diagnosis, and Treatment Maneuvers
Benign paroxysmal positional vertigo is a condition featuring intermittent episodes of head-spinning and issues with body balance when one moves the head.