Sleep problems are common in people with a psychosis‐spectrum diagnosis and are associated with worse psychotic symptoms and lower quality of life. Sleep problems are also frequent in individuals at a clinical high risk for psychosis (CHR‐P) however, less is known about the prevalence and association with symptoms in this population. This study investigates the prevalence of sleep problems within CHR‐P individuals and the associations with attenuated positive symptoms, transition to psychosis, time to transition to psychosis and functioning.

The clinical records interactive search (CRIS) tool was used to carry out a retrospective study of 795 CHR‐P individuals. Sleep problems, subsequent psychotic diagnoses, attenuated positive symptoms and Health of The Nation Outcome Scale scores were extracted. Regression models were used to examine the association between sleep problems and clinical outcomes.

59.5% of CHR‐P individuals experienced sleep problems. Perceptual abnormality severity (OR�=�1.24, 95% CI�=�1.05–1.48) and frequency (OR�=�1.31, 95% CI�=�1.08–1.58) as measured by the Comprehensive Assessment of At‐Risk Mental State interview, predicted sleep problems. Sleep problems were not associated with transition to psychosis; however, they were significantly associated with a shorter time to transition in individuals who developed psychosis (HR�=�1.4, 95% CI�=�1.05–1.88) and higher follow‐up Health of the Nation Outcome Scale scores (MD�=�2.26, 95% CI�=�0.55–3.96).

The high prevalence of sleep problems, along with the association with positive symptoms and worse functioning, highlights the need for effective sleep interventions in this population. Further research is needed to better understand the relationship between sleep problems and transition to psychosis.