Understanding Seasonal Cognitive Changes in Seniors

Expert Reviewed by Michael Tubbs

Blog Summary:

Seasonal changes can significantly affect people living with dementia or cognitive decline. Research shows that memory, mood, sleep, and behavior often worsen during winter and spring months, with changes linked to shifts in daylight, routine disruptions, allergies, and biological rhythms. Families may notice increased confusion, agitation, wandering, or sundowning during these times.

While these fluctuations can feel alarming, they don’t always signal permanent decline. Consistent routines, supportive environments, and attentive care can help older adults navigate seasonal transitions more comfortably and safely.

At Benchmark Senior Living, our memory care communities are designed to provide structure, engagement, personalized support, and secure environments that adapt to residents’ changing needs throughout every season.

Blog:

If you’ve ever felt like your loved one’s memory or mood shifts with the seasons, you’re not imagining it. Research confirms what many families and caregivers have long sensed: cognitive function doesn’t stay constant throughout the year. It fluctuates in measurable, significant ways. For families navigating memory care, understanding this seasonal pattern can bring both awareness and reassurance, and with the right support, those fluctuations don’t have to define your loved one’s quality of life.

What the Research Tells Us

Research shows that during the winter and spring months, individuals may experience noticeable shifts in memory, mood, and behavior compared to other times of year. A landmark 2018 study published in PLOS Medicine found that the seasonal difference in cognition is equivalent to nearly five years of age-related decline, meaning a person may think and remember as if they are five years older in spring than they do in summer or fall. (PLOS Medicine Study) Research also shows a 31% higher likelihood of meeting diagnostic criteria for mild cognitive impairment or dementia during winter and spring. 

This doesn’t mean a winter diagnosis is wrong, or that what you’re observing signals permanent decline. It does underscore the value of noticing patterns, being aware and educated about seasonal fluctuations, and sharing what you notice with your loved one’s care team. As the researchers themselves noted, “there may be value in increasing dementia-related clinical resources in the winter and early spring, when symptoms are likely to be most pronounced.” (PLOS)

Why Spring Can Be Especially Challenging

• Daylight Saving Time “has adverse effects on sleep/wake patterns that last about 5-7 days” (AASM), and for someone with dementia, even a brief shift in routine can trigger increased confusion.
• Increased Risk of Wandering: Warmer weather and longer days provide more opportunities for wandering after a winter of being indoors.
• Hormonal and biological shifts occur as the body adjusts to changing sunlight and temperature, affecting mood, sleep, and overall cognitive function. (Psych Today)
• Allergy-Induced Agitation: High pollen counts can cause physical discomfort and inflammation, which often manifests as increased irritability or poor sleep.
• Seasonal rhythms in Alzheimer’s-related proteins have been identified in spinal fluid, suggesting the disease itself may have a biological seasonal component that peaks during these months. (PLSO)

For someone already living with cognitive challenges, when several of these factors happen at once, they can meaningfully shift how a person thinks, behaves, and stays safe.

What seasonal changes can look like in a loved one

These shifts aren’t always obvious at first. Common signs to watch for include:

• Increased confusion or forgetfulness
• Changes in mood, irritability, or agitation
• Disrupted sleep or insomnia
• Poor appetite or unexplained weight loss
• Heightened anxiety or restlessness
• A stronger desire to go outside or increased wandering behavior
• More frequent episodes of sundowning

These signs can be easy to attribute to disease progression alone, but if they appear or intensify during a certain time of year, the seasons changing may be a contributing factor worth discussing with your loved one’s care team.

How a Supportive Environment Makes a Difference

When the world outside can feel less predictable, a stable, familiar environment becomes one of the most protective factors a person with dementia can have. At Benchmark Senior Living, our memory care communities and neighborhoods are designed with exactly this in mind:

• Structured daily routines built around familiar rhythms reduce confusion and promote a sense of security
• Purposeful, ability-centered programming – daily social engagements, classes, club meetings, and more keep residents connected and engaged through every season.
• Secure, thoughtfully designed environments allow residents to move through their day with confidence, minimizing wandering risk while preserving independence and dignity.
• Trained support means subtle shifts in mood, behavior, or cognition can be noticed early, and responded to before small changes become larger concerns.
• Personalized care that adapts as needs change, including specialized Mind & Memory Care and award-winning care for those who need more advanced support.

When the environment adapts to the person, rather than the other way around, people  often experience greater comfort, confidence, and connection.

Helping Loved Ones Navigate Seasonal Changes

There are meaningful steps families can take to ease seasonal transitions:

• Maintain routines around time changes. The American Academy of Sleep Medicine recommends gradually adjusting sleep and wake times two to three days before Daylight Saving Time to ease the transition.
• Prioritize morning light. Getting outside or near a window first thing in the morning helps reset the body’s internal clock and supports better sleep. (PMC PubMed Central)
• Encourage calming evening activities. Gentle exercise, music, or quiet reading can ease the shift into evening and reduce sundowning symptoms.
• Support safe outdoor engagement. Fresh air and movement are beneficial, ensure outings are structured and supervised, with basic needs like hydration and nutrition met throughout the day. 
• Watch for behavioral changes and communicate what you notice with your loved one’s care team.
• Consider additional support if seasonal changes feel increasingly difficult to manage at home, a memory care community can provide the consistency and specialized care that makes a meaningful difference.

Every Season, We’re Here

Seasonal changes can have a real impact on those living with dementia, but awareness can be a powerful first step. With consistent routines and the right environment, families can help their loved ones stay safe, engaged, and supported no matter the season. 

At Benchmark Senior Living, memory care support isn’t seasonal, it’s consistent, support throughout the year. Our team is here to answer questions, offer guidance, and help you find the right level of support for where your family is right now. 

Frequently Asked Questions:

Can the seasons affect memory and cognitive function in dementia?

• Yes, a major study found that cognitive performance measurably dips during winter and spring compared to summer and fall. The seasonal difference in thinking and memory skills can be equivalent to nearly five years of age-related decline.
• Seasonal fluctuation is real and distinct from long-term decline, though it’s always worth discussing noticeable changes with your loved one’s physician.

Can a memory care community help during these months?

• At Benchmark Senior Living, residents maintain predictable daily routines year-round, with programming that prioritizes physical movement, nutritious meals, and fun social calendars regardless of season.

What can families do to support a loved one struggling with the changing seasons?

• Maximizing exposure to natural daylight helps regulate the body’s internal clock, and maintaining a consistent daily routine provides the predictability that people with dementia rely on. Staying socially connected, even through short visits or phone calls, counters the isolation that winter can naturally bring.
• Consider keeping a simple log of behavioral or cognitive changes month to month, it can be a valuable tool for care conversations and helps distinguish seasonal fluctuation from longer-term progression.

Three quick facts:

• Research confirms that cognitive function fluctuates with the seasons, and for seniors living with memory loss, winter and spring can be the most challenging months of the year.
• From changes in the clock, environment and biology, spring brings a unique combination of pressures that can meaningfully affect how a person with dementia can safely move through each day. 
• Structured routines, trained support, and personalized care can help buffer against seasonal changes and keep your loved one safe and connected year-round.