10% of the population suffers from excessive daytime sleepiness. This can be explained by a variety of etiologies: psychiatric disorders, altered sleep quantity or quality, hypersomnia... The consequences on quality of life are not negligible, with emotional, academic, social, financial and somatic repercussions. Diagnosing and managing them is essential. This is the role of the HFME's Child Sleep Service, a reference center for rare narcolepsy and hypersomnia, which carries out a weekly hypersomnia assessment. In this context, the investigators are carrying out a retrospective descriptive study, the primary objective of which is to describe the results and diagnoses of hypersomnia check-ups in the HFME's Sleep Department, in order to obtain feedback on the center's activity and its evolution.

The secondary objectives are to characterize the patients in the different diagnostic groups, to highlight factors associated with the different diagnoses, and to describe changes in patient characteristics over time.

Inclusion Criteria:

• - Patient hospitalized in the HFME sleep department for a "diagnostic assessment of hypersomnia".
• Age under 18 at the time of hospitalization
• From January 2015 to December 2023

Exclusion Criteria:

• - No balance sheet
• Age over 18 at time of hospitalization
• Assessment for medicolegal or therapeutic adaptation purposes

patients at the HFME university hospital center, third-line referral center for the Auvergne-Rhônes-Alpes region (France)