Alcohol may initially produce drowsiness but can disrupt sleep quality and later-night sleep. It can also affect concentration, mood, routines and participation the following day. These effects may interact with symptoms or medication-related sleepiness, making…Continue Reading

Alcohol dependence can involve impaired control, prioritisation of drinking and continued use despite harm, often with tolerance or withdrawal. It can coexist with schizophrenia and may be shaped by distress, social circumstances or established habits.…Continue Reading

Nicotine dependence involves adaptations that make continued nicotine use reinforcing and stopping uncomfortable. Cravings, irritability, concentration difficulty and other withdrawal experiences can maintain smoking. In schizophrenia, these effects may interact with symptoms, routines and social…Continue Reading

Insomnia involves difficulty falling asleep, staying asleep or obtaining satisfactory sleep despite an opportunity to do so. The person may feel tired, frustrated or unable to function well during the day. In schizophrenia, worry, voices…Continue Reading

Circadian rhythms are approximately daily patterns in physiology and behaviour, coordinated by internal timing systems and environmental cues. Light, activity and social routines help align sleep with the day. Some people with schizophrenia experience delayed…Continue Reading

Histamine contributes to wakefulness through H1 receptors in the brain. Blocking these receptors can produce sleepiness, which helps explain the sedating properties of several antipsychotics. The same broad receptor system is also relevant to appetite…Continue Reading

Daytime sleepiness is a tendency to become drowsy or fall asleep during waking hours. It can interfere with reading, conversation, study and work. Antipsychotic effects are one possible cause, but insufficient sleep, sleep apnoea, irregular…Continue Reading