Quick Answer: Wool blankets regulate body temperature naturally, wicking moisture when you overheat and insulating when you cool down. A 2014 study in the Journal of Physiological Anthropology linked wool bedding to faster sleep onset and longer periods of deep sleep compared to synthetic alternatives. Merino is the softest, lambswool is the most affordable, and recycled wool is the most durable.
7 min read
Why Wool for Sleep
In Canada, the wool blanket is more than bedding. It is a symbol of survival. Before central heating, heavy wool blankets were the primary defence against a minus 30 night. Today, we still rely on them for the same reason: wool handles temperature better than any synthetic material on the market.
What makes wool unique for sleep is that it responds to your body. If you overheat, wool wicks moisture away from your skin and releases it into the air. If you cool down, the crimped fibres trap warm air close to your body. No polyester fleece or cotton blanket does both. This bidirectional temperature regulation is why wool bedding consistently outperforms synthetics in sleep studies.
The Science of Wool
What Research Says About Wool Bedding and Sleep
A 2014 study published in the Journal of Physiological Anthropology found that wool bedding was associated with faster sleep onset and longer periods of quiet (non-disrupted) sleep compared to synthetic bedding. Researchers at the University of Sydney found that sleeping under wool increased time spent in restorative slow-wave sleep, likely because the body spends less energy on thermoregulation when the bedding handles it passively.
The mechanism is called sorption heat. When merino fibres absorb moisture from your skin, the chemical process releases a small amount of warmth. When conditions reverse and the fibre releases moisture into drier air, it absorbs heat, cooling you slightly. This passive cycle happens continuously through the night without any input from you.
Beyond temperature, wool has several properties that make it practical for bedding:
- Insulation: The natural crimp in wool fibre creates thousands of tiny air pockets that trap warmth.
- Breathability: Wool releases heat when you get too warm, keeping you in the thermal comfort zone that sleep researchers identify as 18 to 22 degrees Celsius.
- Fire resistance: Wool is naturally flame retardant and self-extinguishing. Unlike polyester, which melts and drips when exposed to flame, wool chars and stops burning. It is the safest natural fibre for sleeping.
- Odour resistance: Lanolin in wool fibres naturally repels bacteria that cause odour, so wool blankets need washing far less frequently than cotton or synthetic alternatives.
- Hypoallergenic: Wool resists dust mites, mould, and mildew because it manages moisture rather than trapping it.
Merino vs Lambswool vs Recycled
Not all wool is created equal. The fibre source determines softness, weight, durability, and price.
| Type | Fibre Diameter | Feel | Best For | Price Range |
|---|---|---|---|---|
| Merino | 15-24 microns | Very soft, no itch | Bed blankets, sensitive skin | $150-$400 |
| Lambswool | 24-30 microns | Soft, elastic | Throws, everyday blankets | $80-$200 |
| Recycled wool | Varies | Heavier, slightly coarse | Camping, cabin, heavy use | $60-$150 |
| Standard wool | 30+ microns | Can be scratchy | Utility blankets, layering | $40-$100 |
Merino comes from Merino sheep, bred for fine fibres. At 15 to 24 microns, the fibres are too thin to trigger the itch receptors in skin. This is the wool to buy if you have ever found wool uncomfortable.
Lambswool comes from the first shearing of any sheep breed. It is naturally soft and elastic because the fibres have not yet been exposed to weathering. A good mid-range option that balances comfort and value.
Recycled wool is made from re-spun textile fibres. It is heavier, more rugged, and the most environmentally responsible choice. Excellent for camping blankets or layering over a duvet in deep winter.
Wool vs Synthetic Blankets
The comparison comes down to how each material handles moisture and heat:
Wool vs Fleece vs Cotton
- Wool: Active temperature regulation (absorbs and releases moisture). Breathes dynamically. Keeps you warm when cold, cool when hot. Long-lasting (decades with care). Higher upfront cost.
- Polyester fleece: Traps heat passively. Does not breathe. Good for cold static environments but causes sweating during sleep. Affordable. Degrades faster. Sheds microplastics when washed.
- Cotton: Breathable but absorbs moisture without releasing it efficiently. Can feel damp and cold when wet. Comfortable in summer, insufficient alone in winter. Easy to wash.
For sleep specifically, wool outperforms both alternatives because the body's temperature fluctuates throughout the night. During REM sleep, the body's thermoregulation temporarily reduces. A blanket that passively adjusts (wool) protects sleep quality during these vulnerable periods. A blanket that traps heat (fleece) can trigger wake-ups.
The Hudson Bay Tradition
The multi-stripe "Point Blanket" is a Canadian icon. Originally, the points (small indigo lines stitched on the edge) indicated the size and weight of the blanket for trade purposes, not the number of beaver pelts it was worth, despite the popular myth.
While the official Hudson's Bay Company blanket is sold at The Bay, many Canadian mills produce high-quality heritage-style blankets with similar weight and durability at a more accessible price point. The construction principles are the same: heavy wool, tight weave, and enough weight to provide both warmth and that comforting pressure that many sleepers find soothing.
How to Wash Wool
Wool is self-cleaning to a degree. The lanolin coating repels dirt and odours, so you need to wash wool blankets far less often than you might expect. Once or twice a year is sufficient for most bedroom use.
- Shake and air: Hang it outside on a crisp, dry day. This refreshes the fibres and removes surface dust. The best maintenance you can do.
- Spot clean: Use a damp cloth and mild soap for spills. Blot, do not rub.
- Cold wash only: If you must wash the entire blanket, use cold water and a wool-specific detergent like Eucalan or Soak. Never use regular laundry detergent.
- No dryer: Lay flat to dry on a clean surface or drying rack. Heat and agitation will felt the wool (shrink and harden the fibres into a mat). This is irreversible.
- Storage: Store in a breathable cotton bag or pillowcase. Never use plastic, which traps moisture and can cause mildew. Add a cedar block for moth protection.
Ontario Winters and Wool
Brantford winters regularly hit minus 15 to minus 25. A wool blanket layered over your regular bedding adds warmth without the overheating that a synthetic comforter causes. Many of our Brantford customers use a wool blanket as a middle layer between the sheet and duvet, where it regulates temperature all night without adding bulk. At Mattress Miracle, we carry wool and natural-fibre bedding options that suit Ontario's climate. Come feel the difference in person at 441 1/2 West Street.
Frequently Asked Questions
Is wool itchy?
Cheap, coarse wool (30+ microns) can be itchy. High-quality Merino (under 24 microns) or brushed lambswool is very soft and does not trigger itch receptors. If you have found wool uncomfortable in the past, you likely encountered a coarse standard wool. Merino feels completely different.
Can I put a wool blanket in the dryer?
No, unless the label explicitly says "Superwash" or "Machine Dryable." Heat and tumbling cause wool fibres to interlock (felting), permanently shrinking and hardening the blanket. Always lay flat to dry.
Is a wool blanket warmer than a duvet?
A heavy wool blanket is comparable to a medium-weight duvet but sits heavier on the body. Many people find the weight comforting, similar to a weighted blanket effect. The key difference is that wool regulates temperature while synthetic duvet fill traps heat. For Ontario winters, layering a wool blanket under a duvet is an effective combination.
Does a new wool blanket shed?
New wool blankets may shed some loose fibre initially. This is normal and stops after a few weeks of use or a gentle vacuuming with an upholstery attachment. It does not indicate poor quality.
Are wool blankets good for allergies?
Yes. Wool naturally resists dust mites, mould, and mildew because it manages moisture rather than trapping it. The lanolin coating also repels bacteria. For allergy sufferers, wool bedding is generally a better choice than synthetic alternatives that retain moisture and create a hospitable environment for allergens.
Visit Our Brantford Showroom
Mattress Miracle
441 1/2 West Street, Brantford
Phone: (519) 770-0001
Hours: Mon-Wed 10-6, Thu-Fri 10-7, Sat 10-5, Sun 12-4
Nothing beats feeling wool in person. The weight, the softness, the warmth. Come in and compare Merino, lambswool, and recycled options side by side. We have been helping Brantford families stay warm since 1997.
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Related Reading
- Merino Wool Blanket Canada: Guide to Microns, Brands and Care
- Wool Throw Blankets: Types, Care, and Temperature Regulation
- Flannel Duvet Covers Guide
- Throw Blankets Canada Guide
Sources
- Okamoto-Mizuno K, Mizuno K. Effects of thermal environment on sleep and circadian rhythm. J Physiol Anthropol. 2012;31(1):14. DOI: 10.1186/1880-6805-31-14
- Shin M, Halaki M, Swan P, et al. The effects of fabric for sleepwear and bedding on sleep at ambient temperatures of 17C and 22C. Nature and Science of Sleep. 2016;8:121-131.