3 Common Sleep Habits That Harm Brain Health, New Study Reveals

A new study published in early June 2026 has identified three common sleep habits that may significantly impact brain health, according to findings reported by Infobae. The research, which aligns with broader public health warnings about sleep and cognitive decline, highlights how even subtle variations in nightly routines could influence long-term neurological well-being.

The study—conducted by an international team of researchers and published in a peer-reviewed medical journal—examined the relationship between sleep patterns and brain health in over 10,000 participants aged 50 and older. The findings underscore how three specific sleep behaviors, when consistently practiced, may contribute to an increased risk of cognitive impairment, memory loss, or even early-stage dementia.

Three Sleep Habits Linked to Brain Health Risks

The research pinpoints three key sleep-related habits that warrant attention:

• Irregular sleep schedules: Going to bed and waking up at inconsistent times—such as varying bedtimes by more than two hours from night to night—was associated with a 30% higher likelihood of developing mild cognitive impairment within five years. The study suggests this habit disrupts the brain’s ability to consolidate memories and clear toxic proteins linked to neurodegenerative diseases.
• Frequent nighttime awakenings: Participants who woke up three or more times per night reported poorer executive function and slower processing speeds. The study proposes that these disruptions may interfere with the brain’s restorative processes, particularly during deep sleep stages.
• Exposure to artificial light before bedtime: Using electronic devices (such as smartphones or tablets) within one hour of bedtime was linked to a 22% increased risk of cognitive decline. The blue light emitted by these devices suppresses melatonin production, delaying the onset of sleep and reducing overall sleep quality.

While the study does not establish causation—meaning these habits may correlate with but not directly cause cognitive decline—the findings align with prior research from organizations like the World Health Organization (WHO) and the National Institutes of Health (NIH), which emphasize sleep as a critical factor in brain health.

Broader Implications for Public Health

The study’s release coincides with growing global awareness of sleep as a modifiable risk factor for neurological disorders. In April 2026, the WHO reported that nearly 970 million people worldwide experience mental health conditions linked to poor sleep hygiene, including anxiety and depression—conditions that may also accelerate cognitive decline. The new findings add to this body of evidence by specifically targeting sleep habits rather than broader lifestyle factors.

Dr. Javier Quintero, a psychiatrist and lead author of a related 2026 report on mental health and daily habits, noted in a separate interview with Infobae that:

Even small, seemingly harmless deviations in sleep can have a cumulative effect on the brain over time. The good news is that these habits are highly adjustable—unlike genetic risks or irreversible aging processes.

—Dr. Javier Quintero, Chief of Psychiatry, Hospital Universitario Infanta Leonor (Madrid)

Quintero’s remarks reflect a broader trend in medical research: shifting focus from treating cognitive decline to preventing it through behavioral interventions. The study’s authors recommend prioritizing sleep consistency, minimizing nighttime light exposure, and addressing sleep fragmentation as part of a proactive brain-health strategy.

What Remains Uncertain

While the study provides compelling observational data, several questions persist. Researchers emphasize that:

• The study did not account for underlying health conditions (such as sleep apnea or chronic stress) that may independently influence cognitive outcomes.
• Longitudinal data beyond five years is needed to determine whether these habits contribute to dementia progression or merely correlate with early-stage decline.
• Cultural and regional differences in sleep patterns were not fully explored, limiting the generalizability of the findings.

the study does not address potential socioeconomic factors, such as access to quiet sleeping environments or the ability to adopt consistent bedtime routines. Future research may need to incorporate these variables to provide a more holistic understanding.

Practical Steps for Better Sleep and Brain Health

Based on the study’s findings and existing public health guidelines, experts offer the following actionable advice:

• Stabilize your sleep schedule: Aim to wake up and go to bed within a one-hour window each day, even on weekends.
• Reduce blue light exposure: Disable nighttime modes on devices or use blue-light-blocking glasses at least 60 minutes before bed.
• Address nighttime awakenings: Consult a healthcare provider if sleep disruptions persist, as they may signal underlying conditions like insomnia or sleep apnea.
• Create a sleep-conducive environment: Keep bedrooms cool, dark, and quiet to optimize deep sleep cycles.

For individuals concerned about cognitive health, the study serves as a reminder that sleep is not merely a passive activity but an active contributor to long-term brain function. While more research is needed to refine these recommendations, the evidence increasingly points to sleep as a critical—and often overlooked—pillar of neurological well-being.

The full study has not yet been published in an open-access journal, but Infobae’s reporting confirms its methodology, participant demographics, and key findings. Researchers involved in the study are expected to present additional details at an upcoming international conference on neuroscience and aging.