As part of developing a relay alarm project, the aim of the study is to test a sleeper's capability to wake up via a vibrating alarm around the wrist (vibrating bracelet).

Inclusion Criteria:

• speak french
• with social security For healthy volunteers : no sleep disorder, known neurological or respiratory pathology For patients : congenital central hypoventilation syndrome or ventilatory assistance whatever the indication, able to act on their ventilator, and in stable state on the respiratory level for at least 3 months.

Exclusion Criteria:

• subjects taking treatment that may interfere with sleep patterns
• intake of alcohol or any substance (alcohol, drugs) that may interfere with sleep patterns the day before the polysomnography