Inclusion Criteria:
* Age: Participants must be between 20 and 70 years old.
* Diagnostic Criteria: Schizophrenia spectrum disorders, including schizophrenia, schizoaffective disorder, and schizophreniform disorder, diagnosed according to DSM-5 criteria and confirmed with the MINI 7.0 (Chinese version).
* Clinical Stability and Informed Consent: At the time of admission, participants should be in a relatively stable condition, able to understand the study procedures, and capable of providing written informed consent. If patients are unable to fully comprehend due to illness severity or cognitive limitations, consent may be obtained from a legal guardian or family member, with subsequent confirmation of consent by the patient once their condition improves.
Exclusion Criteria:
* Treatment-related: Patients who are currently receiving continuous positive airway pressure (CPAP) therapy for OSA.
* Other Major Central Nervous System Disorders: Presence of other serious conditions that may significantly affect central nervous system function, aside from schizophrenia, such as major depressive disorder or bipolar disorder.
* Severe Medical Illnesses: Including, but not limited to, malignant tumors, end-stage cardiopulmonary disease, neuromuscular disorders severely affecting motor or respiratory function, uncontrolled epileptic seizures, or other serious medical conditions that prevent patients from sleeping in the supine position.
* Clinical Judgment: Patients deemed unsuitable for participation due to clinical conditions (e.g., agitation, non-cooperation, or other safety concerns).
