The extent to which sleep is causally related to mental health is unclear. One way to test the
causal link is to evaluate the extent to which interventions that improve sleep quality also 

In both child and adult psychiatry, empirical evidence has now accrued to suggest that a
single dimension is able to measure a person's liability to mental disorder, comorbidity 

The reliability and validity of traditional taxonomies are limited by arbitrary boundaries
between psychopathology and normality, often unclear boundaries between disorders 

Individuals with disorders that include psychotic symptoms (ie psychotic disorders)
experience broad cognitive impairments in the chronic state, indicating a dimension of 

INTRODUCTION Psychotic disorders such as schizophrenia impose enormous human,
social, and economic burdens. The prognosis of psychotic disorders has not substantially 

The at risk mental state for psychosis approach has been a catalytic, highly productive
research paradigm over the last 25 years. In this paper we review that paradigm and 

The diagnosis of mental disorder initially appears relatively straightforward: Patients present
with symptoms or visible signs of illness; health professionals make diagnoses based 

The Hierarchical Taxonomy of Psychopathology (HiTOP) is a scientific effort to address
shortcomings of traditional mental disorder diagnoses, which suffer from arbitrary 

BackgroundPersonality disorders are now internationally recognised as a mental health
priority. Nevertheless, there are no systematic reviews examining the global prevalence of 

Cannabis use has been reported to induce long-lasting psychotic disorders and a dose-
response relationship has been observed. We performed a systematic review of studies that