The REM Sleep Behavior Disorder Single-Question Screen offers diagnostic sensitivity and specificity in the absence of polysomnography with one question: "Have you ever been told, or suspected yourself, that you seem to act out your dreams while asleep (for example, punching, flailing your arms in the air, making running movements, etc.)?" Diagnostic criteria for RBD from the International Classification of Sleep Disorders (ICSD-3) are:
Repetition of vocalizations and/or complex motor behaviors during sleep
Polysomnography (PSG) show that these behaviors occur during REM sleep
If documentation of these behaviors by PSG is not possible, they must at least be assumed to take place during REM sleep based on records of dream enactment
REM sleep without atonia (RWA) can be seen in polysomnographic recordings
Episodes cannot be explained by another mental disorder, sleep disorder, substance abuse or medication

Differential
Other conditions are similar to RBD in that individuals exhibit excessive sleep movement and potentially violent behavior. Such disorders include non-REM parasomnias (sleepwalking, sleep terrors), periodic limb movement disorder, severe obstructive sleep apnea, and dissociative disorders. Because of the similarities between the conditions, polysomnography plays an important role in confirming RBD diagnosis. Treatment
RBD is treatable (even when the underlying synucleinopathies are not). Melatonin and clonazepam are the most frequently used, and are comparably effective, but melatonin offers a safer alternative, because clonazepam can produce undesirable side effects.
Medical uses
Propranolol is used for treating various conditions, including:

Cardiovascular
Hypertension
Angina pectoris (with the exception of variant angina)
Myocardial infarction
Tachycardia (and other sympathetic nervous system symptoms, such as muscle tremor) associated with various conditions, including anxiety, panic, hyperthyroidism, and lithium therapy
Portal hypertension, to lower portal vein pressure
Prevention of esophageal variceal bleeding and ascites
Anxiety
Hypertrophic cardiomyopathyWhile once a first-line treatment for hypertension, the role for beta blockers was downgraded in June 2006 in the United Kingdom to fourth-line, as they do not perform as well as other drugs, particularly in the elderly, and evidence is increasing that the most frequently used beta blockers at usual doses carry an unacceptable risk of provoking type 2 diabetes.Propranolol is not recommended for the treatment of high blood pressure by the Eighth Joint National Committee (JNC 8) because a higher rate of the primary composite outcome of cardiovascular death, myocardial infarction, or stroke compared to an angiotensin receptor blocker was noted in one study. Psychiatric
Propranolol is occasionally used to treat performance anxiety, although evidence to support its use in any anxiety disorders is poor. Its benefits appear similar to benzodiazepines in panic disorder with potentially fewer side effects such as addiction. Some experimentation has been conducted in other psychiatric areas:
Post-traumatic stress disorder (PTSD) and specific phobias (see subsection below)
Aggressive behavior of patients with brain injuries
Treating the excessive drinking of fluids in psychogenic polydipsia

PTSD and phobias
Propranolol is being investigated as a potential treatment for PTSD. Propranolol works to inhibit the actions of norepinephrine, a neurotransmitter that enhances memory consolidation.