To compare the dosage requirement of etomidate during digestive endoscopy between patients with insomnia and those with normal sleep pattern.

The investigators aim to investigate whether etomidate dosage requirement is increased in patients with insomnia undergoing digestive endoscopy compared with normal sleep patterns.

Inclusion Criteria:

• Patients with insomnia:

  1. Age of 18 - 64 years;
  2. American Society of Anesthesiologists (ASA) physical status of I - II;
  3. Body mass index (BMI) of 15 - 30;
  4. Scheduled for digestive endoscopy under intravenous anesthesia;
  5. Positive screening results according to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) criteria for insomnia disorder;
  6. 8-item Sleep Condition Indicator (SCI; score 0-4; range 0-32, higher score means better sleep) scored 16 or less;

• Patients with normal sleep:

  1. Age of 18 - 64 years;
  2. ASA physical status of I - II;
  3. BMI of 15 - 30;
  4. Scheduled for digestive endoscopy under intravenous anesthesia;
  5. No history or evidence of insomnia.

Exclusion Criteria:

1. Associated with any neurological disease;
2. Daily alcohol consumption;
3. Any contraindication to intravenous anesthetic drug, such as hypotension or shock;
4. History of allergy to any drug used in the study;
5. Pregnancy or breastfeeding;
6. Patients with sleep apnea syndrome;
7. acute upper respiratory infection;
8. Patients with psychological diseases who report suicidal thoughts;
9. Patients who need to work or take care of children/elderly people frequently at night.

Patients with insomnia and patients with normal sleep patterns