Sleep and Affect: Assessment, Theory, and Clinical Implications
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About this ebook
Sleep and Affect: Assessment, Theory, and Clinical Implications synthesizes affective neuroscience research as it relates to sleep psychology and medicine. Evidence is provided that normal sleep plays an emotional regulatory role in healthy humans. The book investigates interactions of sleep with both negative and positive emotions, along with their clinical implications. Sleep research is discussed from a neurobiological, cognitive, and behavioral approach. Sleep and emotions are explored across the spectrum of mental health from normal mood and sleep to the pathological extremes. The book, additionally, offers researchers a guide to methods and research design for studying sleep and affect.
This book will be of use to sleep researchers, affective neuroscientists, and clinical psychologists in order to better understand the impact of emotion on sleep as well as the effect of sleep on physical and mental well-being.
- Contains neurobiological, cognitive, and behavioral approaches
- Explains methods for examining sleep and affect
- Summarizes research on sleep and specific affect states
- Translates research for clinical use in treating disorders
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Book preview
Sleep and Affect - Kimberly Babson
France
Part 1
Definitions
Chapter 1
Neurophysiology of Sleep and Circadian Rhythms
‡
Jeff Dyche*; Katherine C. Couturier†; M. Kate Hall* * Department of Psychology, James Madison University, Harrisonburg, Virginia, USA
† Naval Submarine Medical Research Laboratory, Groton, Connecticut, USA
Abstract
This chapter will outline the biological machinery currently known to underpin the stages of consciousness and the rhythms that modulate them. We will briefly outline the basic functions of our central nervous system and how most researchers divide and categorize the major workings of our brain with an emphasis on the basic behaviors of sleep and alertness and how these two entities are not categorical. During wakefulness, we are kept in an alert state by the workings of some of the most primitive divisions of our brain. However, there are times when a person might be awake but their descriptions of their state varies as a function of what time of day it is and how long they have been awake. Therefore, wake and sleep states are more nuanced; the neural explanations of this will be discussed in detail.
Keywords
NREM sleep
REM
Circadian rhythm
Wakefulness
Sleep deprivation
Neurobiology
During the past half century, behavioral scientists have generally recognized three stages of consciousness: Non-Rapid Eye Movement (NREM) sleep, rapid eye movement (REM) sleep, and wakefulness (National Sleep Foundation, 2014). These three stages are choreographed in predictable processes across a 24-h period, which is the circadian rhythm of the sleep/wake cycle. This cycle depends on multifaceted switching machinery, all of which are modulated by neural mechanisms. The past 50 years have also brought huge advances in neuroscience methodology. Some obvious examples include expensive neuroimaging devices such as functional magnetic resonance imaging (fMRI) and positron emission tomography (PET) scans that have added knowledge on brain functioning and behavior that was heretofore impervious to human understanding (Chee et al., 2006; Drummond & Brown, 2001; Germain, Nofzinger, Kupfer, & Buysse, 2004; Maquet et al., 1996; Ruottinen et al., 2000). But even with additional progress in more traditional electrophysiological and neuroanatomical techniques, sleep remains one of the great mysteries of modern behavioral neuroscience. We spend about a third of our lives asleep yet the exact biological mechanism underlying sleep is not completely described in the literature. Still, with the 1990s being dubbed the decade of the brain,
neuroscience research flourished, and with that momentum continuing as we near the middle of the second decade of the twenty-first century, scientists have been making enormous progress in understanding the mechanisms that control sleep and wakefulness.
In this chapter, we focus on four main areas of the central nervous system: the brainstem, spinal cord, medulla oblongata, and pons. Specifically, nerve cells that form the brainstem, the oldest part of our brain, are located just on top of the spinal cord and extend to the near middle of our brain, looking somewhat like the stem of an ice cream cone with a large overflowing scoop. The spinal cord, the major communication passageway for the motor and sensory portions of our brain, progresses from the inferior portions in the lower back to superior regions near the neck, and then it begins to widen, swell if you will, as it eases into the enigmatic confines of our cranium. This swelling
of nerve cells is the beginning of the brainstem, is called the medulla oblongata, and is located at the bottom (inferior region) of the brainstem. As you might guess, the medulla isn’t where conscious thought occurs, but it is a very important center of behavior as it regulates functions such as breathing, swallowing, and vomiting—automatic behaviors that we don’t have to (or sometimes don’t want to) think about. Only 1.5 in. in length, this oblong material is conical in shape. The bottom smaller portion is basically continuous with our spinal cord while the top wider portion is connected to the bridge of the brainstem called the pons (literally bridge
in Latin, as it connects the lower and upper regions of the brainstem). However, as primitive and as small as the medulla is, it also plays an important role in the functioning of sleep. Animal models have demonstrated that if we lesion the medial (middle) portion of the medulla, REM sleep is altered. When that lesion extends into the pons, REM sleep may be completely eliminated. If that part of a person’s brain was damaged, what are the behavioral ramifications of such a sleep change? How is NREM sleep implicated? And are circadian rhythms modulated by the same or different mechanisms? What are some of the myths and misconceptions of fatigue? These questions and more will be discussed in this chapter.
If I didn’t wake up, I’d still be sleeping.
Yogi Berra
Overview
Normal sleep is divided into two basic groups. One is Rapid Eye Movement sleep or REM,
famous for dream mentation and muscle paralysis and the other is the less celebrated yet equally important non-REM
sleep or NREM.
NREM sleep is further divided into increasingly deeper stages of sleep: stage N1, stage N2, and stage N3. The latter is also referred to as the deepest stage of sleep where the brain produces large, synchronous delta
waves sometimes referred to as slow wave sleep
(Siegel, 2002). While REM sleep is not formally sub-divided, research has demonstrated that REM sleep is comprised of phasic and tonic components (Carskadon & Dement, 2011). Phasic REM sleep is a sympathetically driven state characterized by the stereotypical REMs with some distal twitching of the face and limbs. The tonic portion of REM is more parasympathetically enervated and involves little or no eye movements or twitching of distal muscle groups. Most REM sleep that occurs early in the night is tonic and later episodes are more phasic. The individual role of each subdivision is not yet understood. Of course a paramount feature of REM, whether tonic or phasic, is paralysis of the more proximal skeletal