Playing Call of Duty before bed doesn’t ruin sleep, and it might even boost your memory

Playing a fast-paced action video game for an hour before bed might actually lower stress levels and improve certain memory skills the next day. A recent experiment found that these brief gaming sessions did not negatively affect objective sleep quality in adults who do not typically play video games. The findings were published in the journal Sleep Medicine.

The video game industry commands hundreds of billions of dollars globally every year. With the vast majority of young people and adults engaging in digital play, questions about the physiological and mental effects of gaming are highly relevant. Past research on how games affect health has yielded mixed results. Some reports link video games to increased aggression, elevated anxiety, and disrupted sleep.

Other studies point to clear psychological benefits, suggesting games can relieve stress and assist with emotional regulation. Video games are increasingly utilized in non-recreational settings to build community connections and provide quick mental stimulation. Part of the reason for these conflicting reports is that previous study designs often ignored context. Different types of games demand very different mental responses. A relaxing puzzle game will not stimulate the brain in the same way as a tense survival game.

The duration of the play session also matters immensely. Binge-gaming late into the night is distinct from playing for a single localized hour before a scheduled bedtime. A person’s familiarity with gaming also alters how their brain responds to the activity. Frequent players have developed a tolerance to the mental demands of navigating virtual worlds.

For someone who rarely picks up a controller, learning a new game requires immense concentration and intense mental adaptation. Research shows that human sleep architecture often shifts to accommodate learning and memory consolidation. Specifically, a high demand for learning new tasks can increase sleep continuity and stability as the brain processes new information overnight.

University of Campania researcher Oreste De Rosa led a team to investigate this phenomenon. The researchers designed an experiment to isolate the effects of a high-action, violently themed video game on adults who were unaccustomed to playing. By using short, controlled play sessions, the team hoped to define exactly how the sudden mental challenge of learning an action game would impact sleep patterns, cognitive performance, and general psychological well-being.

The researchers recruited eighteen healthy young adults between the ages of eighteen and thirty-five. To isolate the effects of novelty and learning, all participants were classified as non-gamers. These individuals played video games for no more than one hour per week, with mostly zero weekly playtime. The volunteers completed all parts of the experiment in their own homes to keep their physical resting environment familiar and natural.

The procedure began with a baseline week. Participants wore activity-tracking watches, filled out daily sleep logs, and maintained their normal routines. At the end of the week, the research team recorded their brain activity during sleep using home polysomnography. This type of monitoring uses sensors to track brain waves, eye movements, and muscle activity. The collected data created a highly accurate map of how long it took participants to fall asleep and how often they transitioned between light and deep sleep stages.

The participants also took a battery of cognitive tests to measure skills like memory and attention. They completed standardized mental health questionnaires to assess their current levels of stress, anxiety, and depression. Following the baseline week, the volunteers participated in two separate testing phases lasting four days each. The order of these phases was randomized to ensure fairness in the results.

One phase served as an active control condition. For three consecutive nights, participants watched an action-packed television series, “Money Heist,” for one hour before going to sleep. On the fourth day, the researchers re-administered the cognitive tests and mental health surveys. This reading allowed the team to measure the effects of engaging media that did not involve active physical learning or problem-solving.

In the other testing phase, the participants actively played an action video game for an hour each night instead of watching television. The researchers selected “Call of Duty: Black Ops Cold War,” a popular first-person shooter game. The team chose this specific title because it requires high levels of physical engagement, rapid visual learning, and fast navigation through stressful virtual environments.

Just like the television phase, this phase ended with polysomnography on the third night and cognitive testing on the fourth day. After the data was collected, the researchers compared the results from the baseline week, the television-watching phase, and the video game phase. The results challenged popular assumptions about screen time and physiological arousal before bed.

Playing the violent action game for an hour did not alter objective sleep quality compared to the baseline week. The time it took to fall asleep, the duration of deep sleep, and the number of nighttime awakenings remained totally stable. The sleep architecture components responsible for organizing restorative brain states remained completely intact despite the intense digital combat.

Sleep efficiency actually declined slightly after watching the television series compared to playing the video game. The participants reported feeling sleepier immediately after watching television than they did after playing the game. Yet, the higher alertness associated with gaming did not translate into sleep disturbances later in the physical night.

The researchers suspect that the heavy learning demands required to play the game may have triggered sleep-dependent memory processing. This neurological mechanism might have actively protected the physical structure of the participants’ sleep. The brain needed high-quality sleep to integrate the complex new controller inputs and virtual navigation strategies utilized during the session.

The cognitive tests administered on the mornings following the experiment phases revealed distinct mental benefits linked to the gaming sessions. Participants scored higher on tests of visuospatial working memory after the video game condition. To measure this, scientists used a computerized test where participants had to remember an evolving sequence of colored blocks on a screen while under moderate cognitive pressure.

Visuospatial working memory is the brain’s ability to hold and manipulate visual information in the short term. The mental effort of navigating three-dimensional game maps and tracking multiple moving targets safely provided a sharp cognitive boost the next day. Other areas of cognition like verbal memory and sustained attention did not change across the various testing phases.

Mental health assessments also reflected positive changes following the video game phase. Participants reported lower daily stress levels after the three nights of gaming compared to both the baseline week and the television phase. The specific drops in anxiety and depression scores noted on the digital surveys were not statistically significant.

The interactive, engaging nature of the game appeared to provide a helpful buffer against daily friction and stress. Interacting with a rich digital world gave the non-gamers a potent mental distraction. The results align with growing evidence that commercial video games can be utilized as effective tools for emotional regulation and relaxation routines.

While the study presents a positive view of casual gaming, the researchers outlined parameters limiting the broad application of the results. The experiment intentionally restricted playtime to an hour, and sessions always ended thirty minutes before bed. Prolonged sessions that cut into scheduled sleep time or run throughout the entire evening would likely yield different outcomes. Binge-gaming has consistently been linked to severe sleep disruptions in other studies.

The study examined a small sample of highly specific individuals, focusing purely on young adults who previously avoided video games. Habitual gamers who play daily might not experience the same sleep-protecting learning mechanisms. Their brains are already deeply accustomed to the mechanics of modern digital entertainment.

The cognitive boost observed here relied heavily on the novelty of the challenge. Future research might expand on these findings by varying the types of games used in the evening sessions. Action games rely heavily on quick reflexes and stressful scenarios, but puzzle or strategy games demand slow planning and logic.

Comparing how different digital mechanics alter nocturnal brain activity could help experts develop specific gaming routines designed to improve sleep hygiene. Researchers hope to eventually map precisely how different visual styles and gameplay loops affect the resting human brain. This latest evidence suggests that a short digital combat session might be exactly what an exhausted brain needs to unwind.

The study, “The impact of an action commercial video game on adult non-gamers psychological well-being, cognitive functioning, and sleep,” was authored by Oreste De Rosa, Paolo D’Onofrio, Francesca Conte, Paola De Luca, Claudia Schiavone, Alessio Lustro, Serena Malloggi, Fiorenza Giganti, Torbjörn Åkerstedt, and Gianluca Ficca.