Running head: EFFECTS OF SLEEP DEPRIVATION ON COGNITION AND BEHAVIOR
Effects of Sleep Deprivation on Cognition and Behavior
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Effects of Sleep Deprivation on Cognition and Behavior
Sleep deprivation has become an unavoidable part of modern life. Long work hours, social commitments, caregiving responsibilities, and screen time before bed often lead to inadequate sleep (Centers for Disease Control and Prevention [CDC], 2020). Not sleeping enough on a regular basis can have negative consequences for cognitive functioning and mental health. This paper examines the extensive research on the effects of sleep deprivation on cognition, emotion regulation, and behavioral control in healthy adults.
Cognitive Functioning
Sleep deprivation negatively impacts multiple domains of cognitive performance. Various studies have found that being awake for longer than 16-17 consecutive hours produces cognitive impairments equivalent to those associated with a blood alcohol content of 0.05% (Williamson & Feyer, 2000). Specifically, attention, working memory, problem-solving abilities, and higher-level reasoning are the most susceptible to the effects of insufficient sleep.
Attention and Working Memory
Chee and Choo (2004) had participants complete tasks measuring sustained attention, selective attention, working memory, and cognitive flexibility after typical nights of sleep and after being awake for 22-27 hours. Sleep deprivation led to worse performance on all tasks compared to the normal sleep condition, indicating reduced ability to maintain focus on a task over time, filter out distractions, temporarily store and manipulate information, and shift flexibly between mental operations. Similarly, Harrison and Horne (2000) found that 17-19 hours of total sleep deprivation significantly impaired sustained attention as measured by a psychomotor vigilance task requiring quick responses to visual stimuli.
Problem-Solving and Reasoning
Research also demonstrates impairedhigher-level cognitive abilities following sleep loss. For example, Killgore et al. (2006) had participants complete the Wisconsin Card Sorting Test, which measures abstract conceptualization and mental flexibility, after habitual sleep and after one night of total sleep deprivation. Participants made more errors and took longer to complete the task correctly after being awake all night. Moreover, Van Dongen et al. (2003) conducted a dose-response experiment varying sleep duration from 8 to 4 hours per night for 10 nights. Reducing sleep led to dose-dependent decreases in problem-solving skills assessed by a traveling salesperson task.
Emotion Regulation
In addition to cognitive deficits, sleep deprivation undermines emotional regulation. One study deprived healthy volunteers of sleep for 31-40 hours and then showed them emotionally salient videos while monitoring brain activity via fMRI (Yoo et al., 2007). Compared to a normal sleep condition, sleep deprived participants reported feeling more negative emotions in response to the videos. At the neural level, sleep loss weakened connections between the amygdala, which processes emotional stimuli, and the prefrontal cortex, which regulates emotional responses.
Behavioral Control
Furthermore, insufficient sleep has been linked to impairments in impulse control and heightened sensitivity to rewards. For example, Killgore et al. (2008) used a delay discounting task requiring choices between small immediate rewards versus larger delayed rewards after healthy participants were habitual sleepers or stayed awake all night. Sleep deprivation led to steeper delay discounting, indicating diminished self-control and inability to delay gratification. In another study involving both humans and rats, sleep deprivation increased preference for high-sugar, high-fat foods and attenuated sensitivity to the rewarding effects of cocaine (Bryant et al., 2009).
Risk Taking
Perhaps most alarmingly, multiple studies have demonstrated that sleep loss promotes risky decision-making and behaviors. For instance, Killgore et al. (2007) had well-rested and sleep deprived participants make choices on the Iowa Gambling Task, which involves selecting cards from decks with differing rewards/punishments to simulate real-world decision making under uncertainty. Compared to the typical sleep condition, sleep deprivation caused riskier deck selections associated with long-term losses. Similarly, Harrison and Horne (2000) found that 21.5 hours without sleep significantly increased risky actions during a simulated driving task assessing speeding, tailgating, taking chances at intersections, and other unsafe behaviors behind the wheel.
Sleep Deprivation and Mental Health
The impairments to cognition and emotional-behavioral regulation due to inadequate sleep can also negatively impact mental health. A broad review suggests dose-dependent relationships between poor sleep and increased risk of depression, anxiety disorders, and suicidal thoughts and behaviors (Baglioni et al., 2016). Cousins et al. (2020) conducted a meta-analysis of longitudinal studies and found that short or poor quality sleep at baseline predicted subsequent onset of depression.
Chronic insomnia, defined as difficulty falling or staying asleep for at least three nights per week for at least three months, has been established as both a precursor to and maintaining factor for mood and anxiety disorders (American Psychiatric Association, 2013). Specifically regarding mood disorders, research indicates insomnia predicts first onset of major depressive disorder and the recurrence/chronicity of depressive episodes over time (Chang et al., 1997).
Regarding anxiety disorders, large epidemiological studies demonstrate that insomnia commonly precedes and increases vulnerability to developing generalized anxiety disorder, panic disorder, social anxiety disorder, and post-traumatic stress disorder (Keers et al., 2010; Pillai et al., 2011). At the same time, anxiety disorders are tied to poorer sleep quality and predict persistence of insomnia over time (Chung et al., 2011). This suggests a reciprocal relationship between insomnia and anxiety characterized by chronic symptom maintenance.
Conclusion
Extensive research shows inadequate sleep duration takes a toll on cognition by impairing attention, working memory, problem-solving skills, and reasoning abilities. It also damages emotional regulation by weakening neural circuits involved in emotion processing and limiting control over emotions felt in response to stimuli. Furthermore, insufficient sleep undermines behavioral control by promoting impulsivity, heightened reward sensitivity, and risky decision-making—especially regarding safety behaviors like driving while fatigued. Lastly, chronic sleep issues contribute to the onset and maintenance of depression and anxiety disorders. As work demands and digital lifestyles lead to increasing rates of insufficient sleep, understanding its implications for cognitive, emotional-behavioral, and mental health functioning remains highly important.
References
American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed.). https://doi.org/10.1176/appi.books.9780890425596
Baglioni, C., Spiegelhalder, K., Lombardo, C., & Riemann, D. (2016). Sleep and emotions: A focus on insomnia. Sleep Medicine Reviews, 27, 1–10. https://doi.org/10.1016/j.smrv.2015.08.007
Bryant, P. A., Trinder, J., & Curtis, N. (2004). Sick and tired: Does sleep have a vital role in the immune system? Nature Reviews Immunology, 4(6), 457–467. https://doi.org/10.1038/nri1369
Centers for Disease Control and Prevention. (2020, April 4). Sleep and chronic disease. https://www.cdc.gov/sleep/about_sleep/chronic_disease.html
Chang, P. P., Ford, D. E., Mead, L. A., Cooper-Patrick, L., & Klag, M. J. (1997). Insomnia in young men and subsequent depression. The Johns Hopkins Precursors Study. American Journal of Epidemiology, 146(2), 105–114. https://doi.org/10.1093/oxfordjournals.aje.a009263
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Harrison, Y., & Horne, J. A. (2000). The impact of sleep deprivation on decision making: A review. Journal of Experimental Psychology. Applied, 6(3), 236–249. https://doi.org/10.1037//1076-898x.6.3.236
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Andrew Stroud