Sleep disorder is common in ICU patients, such as reduced sleep time, fragmentation, and abnormal sleep rhythm. In 2023, American Thoracic Society released a research statement on sleep and circadian disruption(SCD) in ICU, which considered SCD is an important potential target for improving critical illness outcomes. Although polysomnography(PSG) is the gold standard of sleep measurement, subjective sleep evaluation tools are still used in most clinical studies related to sleep in ICU. This makes the sleep quality of ICU patients overestimated and difficult to reflect their true sleep conditions. And the answers to how and which outcomes different levels of sleep deprivation affect patient outcomes are still unclear and need to be further explored.

Inclusion Criteria:

• adults (≥ 18-years old)
• anticipated SICU stay for 24 hours or more

Exclusion Criteria:

• pregnancy
• Have a clear history of medication for sleep disorders
• History of mental or psychological illness
• Treated with CRRT or ECMO during monitoring

ICU patients