Reply to Maski K et al. commentary on diagnosis of central disorders of hypersomnolence: Challenges in defining central disorders of hypersomnolence.

Lammers GJ Sleep Wake Centre SEIN, Achterweg 5, Heemstede, the Netherlands; Department of Neurology, Leiden University Medical Centre, Leiden, the Netherlands. Electronic address: g.j.lammers@lumc.nl.
Bassetti CLA Department of Neurology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland; Department of Neurology, Sechenov First State Medical University, Moscow, Russia.
Dauvilliers Y Sleep-Wake Disorders Center, National Reference Network for Narcolepsy, Department of Neurology, Gui-de-Chauliac Hospital, INSERM, U1061, CHU Montpellier, France.