Highlights•Most studies measure morningness/eveningness preference rather than
'chronotype'.•Few longitudinal studies exist, and show contrasting results for the direction of …

The mammalian circadian system is a hierarchically organized system, which controls a 24-
h periodicity in a wide variety of body and brain functions and physiological processes …

Background Epidemiological data show that having the eveningness associates with poor
mental health. For preventive measures it is important to know which underlying factors …

Altered behavioral rhythms are a fundamental diagnostic feature of mood disorders. Patients
report worse subjective sleep and objective measures confirm this, implicating a role for …

Background Sleep and circadian rhythm disruptions are common in patients with mood
disorders. The intricate relationship between these disruptions and mood has been …

Mood disorders such as depression, anxiety, and bipolar disorder are highly associated with
disrupted daily rhythms of activity, which are often observed in shift work and sleep …

Circadian rhythm disturbances are frequently described in psychiatric disorders such as
major depressive disorder, bipolar disorder, and schizophrenia. Growing evidence suggests …

Circadian rhythm is a universal life phenomenon that plays an important role in maintaining
the multiple physiological functions and regulating the adaptability to internal and external …

Several studies have reported separate roles of adenosine receptors and circadian
clockwork in major depressive disorder. While less evidence exists for regulation of the …

Background Screen use before sleep is shown to be positively related to emotional
problems. However, whether this relationship was mediated by circadian phenotypes (ie …