The goal of this observational study is to learn about the benefit of monitoring sleep quality using EEG in patients hospitalized in critical care unit for acute respiratory failure. The main question it aims to answer is:

• Does EEG monitoring improve sleep quality assessment in critically ill patients with acute respiratory failure compared to nurse sleep quality assessment? Participants hospitalized in critical care unit for acute respiratory failure will have their sleep quality assessed by both EEG monitoring and nurse evaluation during their stay in critical care unit.

Inclusion Criteria:

• Adults
• Acute respiratory failure with non-invasive ventilation or high-flow oxygenotherapy hospitalized in critical care unit
• Conscious
• Insurance coverage
• Consent to participate

Exclusion Criteria:

• pregnancy
• cutaneous lesion on the scalp
• guardianship

During their stay in cricital care unit, patients with acute respiratory failure and ventilatory assistance by non-invasive ventilation and/or hig-flow oxygen therapy will included if all criteria are met. Participants will have their sleep quality assessed by both EEG monitoring and nurse assessment during the nights in critical care unit. Variables such as demographics, comorbidities, history of the disease leading to critical care unit, respiratory assessment, anxiety depression scale, sleep quality scale will be monitored.