The Great Conversation: What Is Your Sleep Trying to Tell You?
Hello everyone, and welcome to The Great Conversation.
Sleep is one of the most ordinary things we do.
Every night, we close our eyes and disappear from the world for several hours.
But while we may think of sleep simply as rest, the brain is doing something far more complicated.
During deep sleep, the brain clears metabolic waste, including amyloid-beta, a protein associated with the plaques found in Alzheimer's disease. Sleep also plays an important role in memory and cognitive function.
And increasingly, researchers are discovering that the way we sleep may tell us something about the future health of our brains.
A recent Telegraph article examines several sleep patterns that researchers have associated with dementia risk.
One of the clearest concerns is consistently sleeping too little.
Research following thousands of people over decades found that sleeping six hours or less during midlife was associated with a higher risk of developing dementia later in life.
But surprisingly, sleeping much longer can also be significant.
Regularly needing more than nine hours of sleep, particularly when that represents a change from someone's previous sleeping habits, has been associated with later dementia.
The distinction is important.
Short sleep may contribute to processes that affect the brain over time, while unusually long sleep may sometimes be an early signal that changes are already occurring.
Then there is something even simpler:
regularity.
Emerging research suggests that constantly changing when we sleep and wake may matter independently of how many hours we sleep.
Our brains and bodies operate according to daily rhythms.
When those rhythms become increasingly irregular, particularly later in life, researchers have found associations with cognitive decline and dementia risk.
Some warning signs are more dramatic.
People who physically act out their dreams by shouting, punching, kicking, or falling out of bed may have REM sleep behavior disorder.
Normally, the body becomes temporarily paralyzed during REM sleep.
When that mechanism stops functioning properly, it can sometimes precede neurological diseases such as Parkinson's disease or Lewy body dementia by many years.
Another concern may be sleeping right beside us without us realizing it.
Sleep apnea repeatedly interrupts breathing during the night, causing drops in oxygen and fragmenting sleep.
Loud snoring, daytime exhaustion, and a partner noticing pauses in breathing can therefore be more than annoyances.
They may be signs that the brain is repeatedly being deprived of healthy, uninterrupted sleep.
Researchers are also paying attention to the gradual loss of deep sleep as we age.
Deep, slow-wave sleep appears particularly important for the brain's overnight maintenance processes.
Frequent awakenings and increasingly shallow sleep may reduce the amount of time the brain spends in this restorative state.
Persistent daytime sleepiness and long-term dependence on sleeping medication have also been associated with cognitive decline, although researchers caution that the relationship can be complicated because the underlying sleep problem itself may contribute to the association.
None of these signs means that someone will develop dementia.
The relationship between sleep and dementia appears to work in both directions.
Poor sleep may contribute to changes in the brain, while changes in the brain may themselves begin disrupting sleep years before a diagnosis.
That makes sleep something more interesting than simply a nightly necessity.
It may also be information.
We spend roughly a third of our lives asleep, yet most of us judge our sleep by one question:
Did I get enough?
Perhaps the better question is:
What pattern is my sleep creating over time?
Because our bodies often communicate gradually.
A change in how long we sleep.
A partner noticing that we stop breathing.
A body suddenly moving violently during dreams.
A sleep schedule becoming increasingly irregular.
Persistent exhaustion despite spending enough hours in bed.
Individually, these things may seem easy to dismiss.
But sometimes the body whispers long before it screams.
Which raises a deeper question...
If something as ordinary as the way we sleep can offer clues about the future health of our brains, how closely should we be listening to the patterns our bodies are already showing us?
Take a moment to reflect.
And click the link below to see more on this subject.
