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Related Concept Videos

Nightmares and Night Terrors01:18

Nightmares and Night Terrors

Nightmares and night terrors represent two distinct types of sleep disturbances that differ in timing, characteristics, and the sleeper's recall of the event. Nightmares are vivid, disturbing dreams that usually awaken the sleeper from REM sleep, a stage of sleep where brain activity is high, and dreams are most frequent. Upon awakening, individuals often have detailed recollections of their nightmares, which can include themes of threats to survival, security, or self-esteem.
Nightmares often...
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While variables are sometimes correlated because one does cause the other, it could also be that some other factor, a confounding variable, is actually causing the systematic movement in our variables of interest. For instance, as sales in ice cream increase, so does the overall rate of crime. Is it possible that indulging in your favorite flavor of ice cream could send you on a crime spree? Or, after committing crime do you think you might decide to treat yourself to a cone?
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Panic disorder is an anxiety disorder characterized by recurrent and sudden minutes-long episodes of intense fear, known as panic attacks. These attacks may feel like heart attacks and often happen without warning or a specific cause. They can include symptoms such as rapid heart rate, shortness of breath, chest pain, trembling, sweating, dizziness, and a sense of helplessness. During a panic attack, individuals may feel as though they are experiencing a heart attack or are in a...
REM Sleep Behavior Disorder01:15

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REM Sleep Behavior Disorder (RBD) is a sleep disorder characterized by the absence of muscle paralysis that normally occurs during the REM phase of sleep. This absence allows individuals to physically act out their dreams, which are often vivid and disturbing. Common behaviors exhibited during episodes include kicking, punching, and yelling. These actions can be dangerous, potentially leading to injuries for the person with RBD or their bed partner.
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Sleep-Wake Cycles01:24

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Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
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Protocol for Studying Extinction of Conditioned Fear in Naturally Cycling Female Rats
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Gender differences in nightmare frequency: a meta-analysis.

Michael Schredl1, Iris Reinhard

  • 1Central Institute of Mental Health, Mannheim, Germany. Michael.Schredl@zi-mannheim.de

Sleep Medicine Reviews
|September 7, 2010
PubMed
Summary

Women report nightmares more often than men, but this gender difference in nightmare frequency is not observed in children or older adults. The gap narrows with age, and reporting methods influence effect size.

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Area of Science:

  • Psychology
  • Sleep Science

Background:

  • Nightmare frequency shows reported gender differences across numerous studies.
  • Understanding these differences is crucial for mental health research, particularly concerning conditions like depression and PTSD.

Purpose of the Study:

  • To systematically analyze the gender difference in nightmare frequency across various age groups.
  • To investigate factors influencing the reported gender disparity in nightmares.

Main Methods:

  • A meta-analysis of data from 111 independent studies on nightmare frequency.
  • Analysis of effect sizes across different age groups (children, adolescents, young adults, middle-aged adults, older adults).
  • Examination of variables such as dream recall, depression, childhood trauma, insomnia, and data reporting methods.

Main Results:

  • A significant gender difference in nightmare frequency was found in adolescents, young adults, and middle-aged adults, with women reporting more nightmares.
  • No substantial gender difference was observed in children and older adults.
  • The gender gap in nightmare frequency narrowed with increasing age.
  • Studies using binary items showed smaller effect sizes compared to those using rating scales.
  • The data source (child vs. parent reporting) was a highly influential variable.

Conclusions:

  • The gender difference in nightmare frequency is age-dependent, emerging in adolescence and diminishing with age.
  • Methodological factors, such as the way nightmares are measured, impact the observed gender difference.
  • Further research into explanatory variables is needed to understand nightmare etiology and potential links to other mental health conditions.