摘要：

Patients suffering from or primary syndrome present of a predominantly obstructive type which follow one another without interruptions throughout the duration of . It is not possible to ascribe the somnolence of these patients to carbonarcosis, because in most cases Pa CO2, though high during , presents normal values or slightly higher than normal values during wakefulness. Obstructive are the cause of this syndrome: the elimination of obstructive by means of tracheostomy leads to a complete clinical recovery. Before they began to suffer from hypersomnia, all these patients had been snoring heavily for many years. Snoring is therefore a fixed stage in the evolution of this disease. The fact that the overall clinical and polygraphic characteristics of these syndromes are identical suggests that they all constitute a single nosographic entity, which we have called "hypersomnia with periodic ".

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