How Smell Affects Your Sleep (2024)

The Relationship Between Smell and Sleep

Smell and sleep have a bidirectional relationship Trusted Source National Library of Medicine, Biotech InformationThe National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information.View Source . This means that sleep can affect the sense of smell, and smell can affect sleep.

One factor that influences the sense of smell is the circadian rhythm. The circadian rhythm is known for how it promotes sleeping during the night and wakefulness during the day, but it affects numerous other bodily processes as well. Sensitivity to smell can change throughout the day Trusted Source National Library of Medicine, Biotech InformationThe National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information.View Source , and lower sensitivity at night helps encourage sleep. Sleep can also contribute to how smell is perceived and remembered.

Research has also shown that smell can have an effect on how long it takes to fall asleep, in addition to overall sleep quality and quantity. Distinct scents may promote better sleep, help people wake up in the morning, or even influence dreams and memory formation during sleep.

Can Certain Smells Help You Sleep Better?

Because of the power of the sense of smell, certain fragrances may contribute to better sleep. Some scents promote relaxation that makes it easier to fall asleep and feel well rested the next day.

Not surprisingly, some scents are commonly associated with a more inviting bedroom environment. The smell of fresh sheets, for example, may make people look forward to going to bed. There are indications that bringing other scents into the bedroom with aromatherapy may promote better sleep.

What Are the Best Scents for Sleep?

There is no consensus about the best types of aromatherapy for sleep. What works best for any individual may depend on the nature of their sleeping problems and their fragrance preferences.

Essential oils have shown benefits for sleep in research studies. However, it is important to remember that much of this research is preliminary or conducted in specific populations or settings that may not apply to the public as a whole.

Anyone with sleeping problems should talk with a doctor. Aromatherapy should not replace other treatments for insomnia or sleep disorders.

Lavender

Among essential oils, few have been studied as much as lavender. Lavender has been associated with improved sleep in multiple research studies, including in some people with insomnia. The smell of lavender has calming effects Trusted Source National Library of Medicine, Biotech InformationThe National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information.View Source on heart rate and blood pressure as well as mood. In a study of people exposed to lavender before bed, deep sleep increased Trusted Source National Library of Medicine, Biotech InformationThe National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information.View Source , leading to feeling more refreshed in the morning.

Rose

Roses have a reputation for their appealing fragrance, and rose essential oils have shown potential as aromatherapy for sleep. While not conclusive, a study in people with depression showed some indicators of enhanced mood and sleep Trusted Source SpringerLinkSpringerLink provides researchers with access to millions of scientific documents from journals, books, series, protocols, reference works, and proceedings.View Source when they inhaled rose-scented air during sleep.

In a study conducted in a hospital’s coronary care unit, aromatherapy with scents from a type of rose known as damask rose showed significant improvement in sleep quality Trusted Source National Library of Medicine, Biotech InformationThe National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information.View Source .

Roman Chamomile

In one study, roman chamomile essential oil applied to pillows improved total sleep time Trusted Source National Library of Medicine, Biotech InformationThe National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information.View Source for older adults in managed care settings. In a separate study in people with cancer, massages given with a carrier oil blended with roman chamomile essential oil reduced self-reported levels of anxiety.

Jasmine

Jasmine essential oil that was dispersed in a bedroom during sleep was found to improve sleep efficiency Trusted Source National Library of Medicine, Biotech InformationThe National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information.View Source , meaning that more of the time a person was in bed was actually spent sleeping.

Cedar Extract

Though not studied as extensively, a study using the scent of cedar extract helped people fall asleep more quickly when taking a nap during the daytime.

Cannabis

A preliminary study with cannabis essential oil made from plants that do not contain THC, the compound most responsible for the high associated with cannabis, found improved relaxation Trusted Source National Library of Medicine, Biotech InformationThe National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information.View Source among people who inhaled this scent.

Ylang-Ylang

Ylang-ylang essential oil, derived from the Cananga tree, has been associated with calmness and slowed reaction times Trusted Source National Library of Medicine, Biotech InformationThe National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information.View Source , which may make it helpful in the lead-up to sleep.

What Are the Best Scents To Wake You Up?

As with aromatherapy for sleep, there is no guaranteed scent that will make everyone feel alert, but research has highlighted a few fragrances that may be beneficial.

Coffee

Drinking coffee is one of the most popular pick-me-ups, but not everyone likes the flavor or wants to consume caffeine. Another option may be just smelling coffee without drinking it. A research study found that breathing in the smell of coffee improved alertness, attention, and memory without the physical effects of caffeine.

Rosemary

Rosemary essential oil has been found to be a stimulant Trusted Source National Library of Medicine, Biotech InformationThe National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information.View Source that helps activate the brain and may promote alertness and overall cognition.

Peppermint

Peppermint essential oil has a distinct smell and in some research has boosted memory recall and feelings of alertness.

Sage

Preliminary research with essential oils from common sage and Spanish sage have found both to be associated with enhanced mental performance Trusted Source National Library of Medicine, Biotech InformationThe National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information.View Source .

Aromatherapy for Sleep

Aromatherapy utilizes scents from plants to try to enhance different aspects of health. Forms of aromatherapy date back to ancient Egypt and are based on the use of essential oils, which are liquids made with materials extracted from plants like flowers or herbs.

Can Aromatherapy Help With Sleep?

Evidence suggests that aromatherapy may be able to help with sleep by creating a bedroom environment that is more conducive to falling asleep and staying asleep.

Exposure to smells that are associated with a positive mood, calmness, and relaxation may be beneficial in the lead-up to bedtime and through the night. Stress and anxiety frequently contribute to sleeping problems like insomnia.

By promoting relaxation, certain essential oils may reduce this barrier to sleep. While promising research supports the potential of aromatherapy to improve sleep, more rigorous research is needed before it can be considered a standard treatment for insomnia or other sleep disturbances.

References

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