It is more common in males overall, but equally frequent among men and women below the age of 50. This may partially be due to a referral bias, as violent activity carried out by men is more likely to result in harm and injury and is more likely to be reported than injury to male bed partners by women, or it may reflect a true difference in prevalence as a result of genetic or androgenic factors. Typical onset is in the 50s or 60s.Almost half of those with Parkinsons, at least 88% of those with multiple system atrophy, and about 80% of people with Lewy body dementia have RBD. RBD is a very strong predictor of progression to a synucleinopathy (for example, the Lewy body dementias). On autopsy, up to 98% of individuals with polysomnography-confirmed RBD are found to have a synucleinopathy. History
In the 1960s and 1970s, Michel Jouvet described brain lesions in cats that led to loss of atonia in REM sleep. Carlos Schenck and Mark Mahowald and their team in Minnesota first described RBD in 1986. In animals
RBD has also been diagnosed in animals; specifically dogs. See also
Sleepwalk with Me
Pseudobulbar affect
Gelastic seizure

References
Further reading
Roguski A, Rayment D, Whone AL, Jones MW, Rolinski M (2020). "A Neurologists Guide to REM Sleep Behavior Disorder". Front Neurol (Review). 11: 610. doi:10.3389/fneur.2020.00610. PMC 7360679. PMID 32733361.
This does not necessarily mean that the woman or fetuss health is being compromised, but it is painful and is an important indication for doctors to pay attention to warning signs of prolonged labor. Prolonged active labor
The phase of labor that extends into multiple hours (at least 14). The cervix usually dilates to over 4 cm before active labor occurs. When it first begins, it is encouraged that women stand up, walk around, and eat or drink. If failure to progress extends beyond this point, preventive measures need to be taken. Causes
Fetal malpresentations
Fetal malpresentations are irregular positions of the crown of the fetal head in relation to the mothers pelvis (the fetus is in an abnormal position). Some important ways to manage fetal malpresentation are making rapid evaluations of the condition of the women pertaining to vital signs as well as the heart rate of the fetus. If fetal heart rate is abnormal, and if membranes have ruptured and amniotic fluid is atypical, it is important for medical professionals to determine the presenting part of the fetus and the position of the fetal head. Possible delivery methods, if this is the case, are compound presentation, vaginal breech delivery, or caesarean section for breech presentation depending upon the severity of the malposition. Uterine contractions
This refers to uterine conditions that result in the uterus not having enough coordination or strength to dilate the cervix and push the baby through the birth canal. Issues with uterine contractions are the main cause of prolonged labor during the latent phase.