Où en sommes-nous sur l'effet première nuit chez des patients souffrant de troubles du sommeil ?

Usually sleep investigations in the laboratory are based on a single night polysomnography. We provide a review of the recent literature on the first night effect in patients suffering from sleep disorders. The first night effect is present in different subject categories (healthy, sleep apneic, depressed). Although it is difficult to identify a formal indication to the realization of a second systematic recording, some authors point out the interest in achieving a second consecutive recording especially in apneic patients, due to the variability in the apnea hypopnea index.