"Dementia, Stay Away": Smelling "This Scent" Before Bed Boosts Older Adults' Memory 3-Fold

Olfactory stimulation with natural essential oils improves cognitive ability
Simply listening to music lowers the risk of dementia by 39%

Studies have found that a decline in the sense of smell is associated with neurodegenerative diseases such as Alzheimer's. Now, a new study has found that olfactory stimulation before bed can improve cognitive function.

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Recently, researchers at the University of California, Irvine, conducted an experiment involving adults aged 60 to 85. Each night before bed, participants put essential oils in a diffuser, which released the scents during the first two hours of sleep. For seven days, they rotated among seven natural essential oils: rose, orange, eucalyptus, lemon, peppermint, rosemary and lavender.

After observing the participants for six months, researchers found that the group receiving olfactory stimulation showed a 226% improvement in memory compared with the control group on cognitive assessments, including tests of their ability to remember word lists. MRI scans also showed that the integrity of the uncinate fasciculus, a neural pathway connecting the medial temporal lobe, the brain's memory center, with the frontal lobe, which is responsible for decision-making, had substantially recovered to levels seen in people in their 20s.

While other senses, such as sight and hearing, are relayed through various parts of the brain, the sense of smell is directly connected to the brain's memory and emotional centers, the hippocampus and amygdala, through neural circuits. This is also why losing the ability to smell with age is a strong early sign of dementia. Stimulating the brain directly with various scents during sleep may help strengthen neural networks and prevent dementia, without requiring any special effort while awake.

The researchers explained, "Even while we sleep, our olfactory nerves remain awake," adding that "continuous olfactory stimulation essentially massages the brain's memory circuits throughout the night."

The brain can also be stimulated through senses other than smell. Recently, a research team led by Professor Joanne Ryan of Australia's Monash University followed more than 10,000 adults aged 70 and older for 10 years. Those who listened to music almost every day had a 39% lower risk of developing dementia than those who did not.

Interestingly, "listening to music" had a more pronounced effect than "playing a musical instrument." The group that played instruments saw a 35% reduction in dementia risk. Simply listening to music appears to be enough to elicit a strong response in the brain and stimulate neural pathways.

A meta-analysis has also found that listening to music before bed improves sleep quality. When sleep is disrupted, the brain cannot recover, and memory and concentration can quickly suffer. Music improves sleep quality and helps the brain recover. It also helps protect brain cells from damage by lowering levels of cortisol, the stress hormone.

This content was produced with the assistance of AI translation services.