Bedtime Aromatherapy May Boost Memory and Protect the Mind


Breathing in pleasant scents during sleep may offer an effective, low-effort way to improve brain health and potentially help deter dementia.

  • In a small experiment involving 23 older adults aged 60 to 85 without memory impairment, neuroscientists found that inhaling odorants while asleep seemed to dramatically enhance a person’s memory over the course of six months.
  • “When people are given olfactory [relating to sense of smell] enrichment, their memory areas become larger and more functional,” says study author Michael Leon, PhD, a professor of neurobiology and behavior at the University of California, Irvine. “Conversely, when olfaction is compromised, the memory centers of the brain start to deteriorate.”
  • Essential Oils Used in a Diffuser for First Two Hours of Sleep. For the project, participants were divided into two groups. Those in the olfactory enrichment group were provided with an odorant diffuser and seven essential oil odorants (rose, orange, eucalyptus, lemon, peppermint, rosemary, and lavender).

They were asked to turn on the diffuser when they went to bed, and the scent was released into the air during the night for two hours when they first went to sleep. The participants rotated through the different odorants each night.In the control group, individuals were also provided with an odorant diffuser and followed the same routine. Rather than essential oils, though, they were provided with bottles that contained distilled water with an undetectable trace amount of odorant added.

Bedtime Aromatherapy Resulted in Dramatic Improvement in Cognitive Testing

At study start and end, participants completed a word-list test commonly used to evaluate verbal learning and memory. After six months, those receiving the aroma treatment had a 226 percent increase in cognitive capacity compared to the control group, according to findings recently published in the journal Frontiers in Neuroscience.


Smell and Memory Have Long Been Linked. While this investigation was small in size, the results align with other scientific findings demonstrating a connection between smell and cognition, says Jay Gottfried, MD, a professor of neurology and psychology at the University of Pennsylvania in Philadelphia, whose research focuses on sense of smell and its effects on the brain.

Imaging Confirms Brain Benefits of Aromatherapy

Leon and colleagues also conducted brain imaging that revealed better integrity in the brain pathway called the left uncinate fasciculus in those who used aromatherapy. This pathway, which connects the memory-essential medial temporal lobe to the decision-making prefrontal cortex, becomes less robust with age.Although quality of sleep did not appear to differ significantly between the aroma group and the controls, the Sleep Foundation has indicated that breathing in aromas during sleep may contribute to better rest, which is essential for the formation and storage of long-term memories.

Michael Yassa, PhD, a study co-author and professor in the neurobiology of learning and memory at the University of California, Irvine, suggested that more investigation might be directed at therapies that maintain the sense of smell.“Everyone has experienced how powerful aromas are in evoking recollections, even from very long ago,” he said in a statement. “However, unlike with vision changes that we treat with glasses and hearing aids for hearing impairment, there has been no intervention for the loss of smell.”

The importance of consulting a doctor

Consulting a doctor before starting aromatherapy is of utmost importance for several reasons: Consulting a doctor before starting aromatherapy is of utmost importance for several reasons:Individual Variations: Every individual is unique, and their body may react differently to essential oils. Some oils can trigger allergic reactions, skin irritation, or even more serious issues, especially for people with sensitive skin or allergies.


Medical Conditions: Some individuals might have specific medical conditions that make certain aromas unsafe or undesirable. Certain oils can affect blood pressure, hormonal balance, or interact with specific medications.

Pregnancy and Children: Pregnant women and children should particularly avoid certain essential oils, as they can have adverse health effects. For instance, some oils might induce uterine contractions in pregnant individuals, which can be dangerous.