Daytime dysfunction due to difficulty initiating sleep or lack of good sleep.
A common emergency department complaint among patients in recovery from a substance use disorder or a psychiatric disorder
Most substances of abuse affect sleep during active use, acute withdrawal, and with sustained abstinence
Specific medications for<unk>  should be avoided in patients with history of substance abuse.
Most substances of abuse affect sleep during active use, acute withdrawal, and with sustained abstinence
Insomnia
Alcohol Abuse, alcohol, benzo, or opioid withdrawal
Ergotism
Depression/anxiety
Sedation 
Bipolar disorder, schizophrenia
Hiccups
Hepatic encephalopathy