Why Does the Room Spin When You Turn in Bed? BPPV Explained

You are lying comfortably in bed and roll onto your left side to sleep. Suddenly the entire room begins spinning — a violent, nauseating sensation that lasts about 20–40 seconds and then stops. You lie still, terrified. After a few minutes you cautiously move again — and it happens once more. This is Benign Paroxysmal Positional Vertigo (BPPV) — the most common cause of vertigo worldwide, highly characteristic, and curable in most cases with a 5-minute physical manoeuvre.

What Actually Causes BPPV

Inside the inner ear are three semicircular canals — fluid-filled loops that detect head rotation. Attached to the base of these canals are tiny calcium carbonate crystals called otoconia (also called "ear rocks" or "ear stones"). These normally sit in a specific chamber (the utricle) and detect linear acceleration and gravity.

In BPPV, some of these crystals become dislodged and fall into one of the semicircular canals — usually the posterior canal. When the head moves in a particular direction, the crystals roll through the canal, generating a false signal of rotation. The brain receives conflicting information from the ears and eyes — and the result is the violent spinning sensation. The nystagmus (rapid eye movement) visible during an attack is the brain's response to this false rotation signal.

Why It Starts, Stops, and Comes Back

Starts: often after a period of lying flat for an extended time (bed rest, holiday, surgery), a blow to the head, or spontaneously for no identifiable reason. Stops after a few seconds because the crystals stop moving. Goes away when the crystals eventually return to their resting position — spontaneous resolution occurs in many patients within 4–6 weeks. Returns if the crystals dislodge again — BPPV has a recurrence rate of approximately 30% per year.

The Epley Manoeuvre — The Cure

The Epley manoeuvre repositions the dislodged crystals from the posterior canal back to the utricle using a sequence of head positions. Success rate: 85–95% in a single treatment session. The sequence: starting sitting, head turned 45° toward the affected ear → rapid lay back with head hanging (Dix-Hallpike position) → hold 30 seconds → rotate head 90° to opposite side → roll body to face downward → return to sitting. Each position is held for 30 seconds to allow crystals to settle. This manoeuvre can be performed in the clinic and taught for home use.

BPPV is diagnosed by the Dix-Hallpike test — lying back with the head turned 45°, watching for upbeat-torsional nystagmus appearing after a 2–10 second latency and lasting under 60 seconds. This is the gold standard test. Imaging (MRI) is not needed for classic BPPV.

For BPPV diagnosis and Epley manoeuvre: Sri Anand CNC, Chanda Nagar, Hyderabad. Call +91 90633 66983.