Dust mites.

I know, not the most fun topic.

What are they, exactly? DustMites.org defines dust mites as "microscopic creatures that live in your bedding by the millions and cause allergies."

In fact, they say that, 

"Dust mite allergies are the most common type of allergy. It’s been estimated that 70% of all allergy sufferers are allergic to dust."

This website has some good suggestions, like removing carpeting in bedrooms, improving ventilation with air conditioning or opening the windows, and vacuuming or mopping floors weekly (I would try daily for awhile).

But they did not mention Geraniol . . .

Geraniol, the primary component in Palmarosa essential oil (Cymbopogon martini var. motia) was proven in a 2008 research study to be one of the most effective essential oil constituents for naturally reducing dust mites (which can aggravate respiratory allergies) and is considered more effective than DEET (1).

To naturally reduce dust mites with essential oils, I suggest using a simple linen spray made with Palmarosa and Lavender.

After washing your linens in a hot wash, spray it on your sheets a few times a day. It smells amazing, and really is a helpful, natural way to reduce dust mites.

Dust Mite Linen Spray

• 8 oz (240 ml) water in a spray bottle
• 60 drops Palmarosa essential oil (Cymbopogon martini var. motia)
• 20 drops Lavender essential oil (Lavandula angustifolia)

I recommend making a fresh bottle every few weeks, since it's not made with a preservative.

Research Reference:
1. Jeon JH, Kim HW, Kim MG, et al (2008) Mite-control activities of active constituents isolated from Pelargonium graveolens against house dust mites. Journal of Microbiology and Biotechnology 18(10):1666-1671