Final answer:
An Alcohol/substance use sleep disorder would be diagnosed when substance use affects sleep, leading to significant distress or impairment, as per DSM-5 criteria.
Step-by-step explanation:
When would Alcohol/substance use sleep disorder be diagnosed? According to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), an Alcohol/substance use sleep disorder would be diagnosed a) When substance use affects sleep, leading to significant distress or impairment. This condition falls under the category of substance use disorders, characterized by a pattern of compulsive drug use despite adverse consequences. Such disorders can disturb sleep patterns, leading to sleep disorders that impact an individual's well-being significantly.
Substances, including alcohol, cocaine, and marijuana, interact with various neurotransmitter systems in the brain, such as GABA, dopamine, and opioid systems, which can alter normal sleep architecture. The use of these substances might lead to problems like insomnia or parasomnias, hence the diagnosis of a sleep disorder related to substance use when sleep is adversely affected.