Why do whirling dervishes return

There is no term to return to Mevlevi. Mevlevi sema.

Sema, symbolically, the formation of the universe, the resurrection of man in the realm,
The transition to the movement to the movement to the Supreme Creator.

All the secrets lies in the slightly bending their heads on their way back.
This slope provides equal stimulation of the balance circular ducts in the inner ear. Here's the whole secret here.

He says that the exercises of whirling dervishes, neurology and ENT physicians are very similar to the vestibular tests.