Sleep On It: How Snoozing Strengthens Memories

 

When you learn something new, the best way to remember it is to sleep on it. That’s because sleeping helps strengthen memories you’ve formed throughout the day. It also helps to link new memories to earlier ones. You might even come up with creative new ideas while you slumber.

senior sleeping

What happens to memories in your brain while you sleep? And how does lack of sleep affect your ability to learn and remember? National Institutes of Health (NIH)-funded scientists have been gathering clues about the complex relationship between sleep and memory. Their findings might eventually lead to new approaches to help students learn or help older people hold onto memories as they age.

“We’ve learned that sleep before learning helps prepare your brain for initial formation of memories,” says Dr. Matthew Walker, a sleep scientist at the University of California, Berkeley. “And then, sleep after learning is essential to help save and cement that new information into the architecture of the brain, meaning that you’re less likely to forget it.”

While you snooze, your brain cycles through different phases of sleep, including light sleep, deep sleep, and rapid eye movement (REM) sleep, when dreaming often occurs. The cycles repeat about every 90 minutes.

The non-REM stages of sleep seem to prime the brain for good learning the next day. If you haven’t slept, your ability to learn new things could drop by up to 40 percent. “You can’t pull an all-nighter and still learn effectively,” Walker says. Lack of sleep affects a part of the brain called the hippocampus, which is key for making new memories.

You accumulate many memories, moment by moment, while you’re awake. Most will be forgotten during the day. “When we first form memories, they’re in a very raw and fragile form,” says sleep expert Dr. Robert Stickgold of Harvard Medical School.

But when you doze off, “sleep seems to be a privileged time when the brain goes back through recent memories and decides both what to keep and what not to keep,” Stickgold explains. “During a night of sleep, some memories are strengthened.” Research has shown that memories of certain procedures, like playing a melody on a piano, can actually improve while you sleep.

Memories seem to become more stable in the brain during the deep stages of sleep. After that, REM—the most active stage of sleep—seems to play a role in linking together related memories, sometimes in unexpected ways. That’s why a full night of sleep may help with problem-solving. REM sleep also helps you process emotional memories, which can reduce the intensity of emotions.

It’s well known that sleep patterns tend to change as we age. Unfortunately, the deep memory-strengthening stages of sleep start to decline in our late 30s. A study by Walker and colleagues found that adults older than 60 had a 70 percent loss of deep sleep compared to young adults aged 18 to 25. Older adults had a harder time remembering things the next day, and memory impairment was linked to reductions in deep sleep. The researchers are now exploring options for enhancing deep stages of sleep in this older age group.

“While we have limited medical treatments for memory impairment in aging, sleep actually is a potentially treatable target,” Walker says. “By restoring sleep, it might be possible to improve memory in older people.”

Source: Assisting Hands® in association with IlluminAge, © IlluminAge 2013

“Remember When…?” The Value of Reminiscing

 

All people reminisce. Remembering times past is a pleasant diversion, stimulates the mind, and helps give us perspective and a sense of who we are. As a study from the Association for Psychological Science stated, “Nostalgia is now emerging as a fundamental human strength.”

Reminiscing, the process of “life review,” is an important part of old age. As seniors recall their accomplishments and come to terms with past conflicts and disappointments, they achieve a heightened sense of personal identity and meaning in life.
Reminiscing also enhances self-esteem. Studies suggest that seniors who are encouraged to share events from their lives with others experience an increased sense of peace and self-worth. We all have a lifelong need to see ourselves as unique individuals, and the recollection of pleasant experiences, past accomplishments, and triumphs over adversity is part of this.

Reminiscing can be an important tool for socialization. Think about what happens when you first make a friend: you spend much time “filling each other in” on your life history—who you are and have been, where you have lived, who is important in your life. When a senior moves to a nursing home or assisted living community or begins to receive care in the home, sharing memories is a great way for staff to get to know the person better by learning about their life stories and accomplishments.

Reminiscing can be especially important for cognitively impaired persons. Those with Alzheimer’s disease or other dementia can often recall long-past occasions better than the events of the current day, since the disease affects long-term less than short-term memory. Interactions that include the recollection of events past can have a positive effect on the dementia patient’s emotional well-being.

Why Does My Loved One Repeat the Same Stories?

Sometimes family members and friends are concerned if an older loved one repeats stories, returning to the same ones again and again. But recognize that this, too, is part of the life review process: the repeated stories are probably those that the person finds the most pleasant to recall, or they may concern events that he or she is “working through.” Remember that a response from you is not necessarily required; your loved one may just need you to listen in a non-judgmental manner.

Sometimes an older adult may seem to dwell upon life experiences that cause sadness, anger or frustration. Understand that this, too, is a way of dealing with the past and can be a sign of emotional health. Allow these feelings to come out, and don’t try to suppress such expressions by immediately attempting to cheer up or distract your loved one. But if he or she seems “stuck” in a particular disturbing experience or time, encourage your loved one to speak to the healthcare provider.

Older adults are a treasury of stored experience. Life review and discussing “the good old days” is a beneficial, purposeful activity that helps older adults maintain a positive outlook. The Association for Psychological Science explains, “Nostalgia may provide a link between our past and present selves—that is, nostalgia may provide us with a positive view of the past and this could help to give us a greater sense of continuity and meaning to our lives.”

Encouraging the Sharing of Memories

If reminiscing seems beneficial for your loved one, here are some techniques that eldercare mental health specialists recommend for starting a conversation revolving around the recalling of the past:

Try a multisensory approach, using “jump starts” such as photographs, music, smells, and things to be touched.

Ask questions beginning with “Tell me about the time….” Encourage your loved one to talk about his or her childhood, school days, courtship, experiences during the Depression and wartime years, and other important life events.

Help your loved one write or record his or her autobiography. This is a meaningful task that provides the satisfaction of knowing that the two of you are producing a record that will be valued by generations to come. For some useful tips on creating a record of life experiences, visit the StoryCorps website (www.storycorps.net).

Source: Assisting Hands® in association with IlluminAge, © IlluminAge 2013