The aim of the study is to evaluate the impact of sleep quality on extubation failure rate in intensive care unit patients at high risk.

Inclusion Criteria:

• Intensive care units patients intubated for at least 24 hours with at least on of the four following risk factor : aged of 65 years or more, any underlying chronic cardiac or lung disease, mechanical ventilation for more than 7 days.
• aged of 18 years or more

Exclusion Criteria:

• peripheral or central nervous system pathology
• known psychiatric pathology or agitation
• patient with decision of no reintubation
• patient refusal
• clinical worsening before polysomnography ( shock with vasopressors drugs, coma, PaO2/FiO2 ratio < 150 with respiratory distress signs, coma with Glasgow scale <8)
• pregnant or breastfeeding women
• patient under legal guardianship or protection
• patient with no health insurance coverage
• aged < 18 years

Intensive care unit patients, intubated at least 24 hours, at risk of extubation failure