How we test products
Our mission is to take the guesswork out of finding the perfect sleep products.
We've dedicated hundreds of hours to testing mattresses and sleep accessories, and rely on a team of testers of differing weights, temperature preferences, and sleeping positions to evaluate each product.
Tested products are granted the Sleep Hero tested stamp of approval, a mark of our review's reliability.
If we haven't personally tested a product, please be assured that we invest significant time and energy into scouring the UK market and researching the best recommendations, and we work with a team of sleep experts who review our articles, ensuring that the insights we provide are not only relatable but also reliable.
Hypnia duvet composition
The Hypnia All Seasons duvet is crafted from 100% recycled hollow slick, a material known for its breathability and lightweight nature.
This eco-friendly choice feels soft and gentle on the skin, so your comfort doesn't come at the planet's expense.
The Hypnia duvet is designed to suit different needs and seasons. ☀️❄️
It has 200g/m² and 300g/m² layers, which can be combined by tying bows at each corner, which can be slightly impractical.
- The 200g/m² layer for summer
- The 300g/m² layer for spring/autumn
- The 200g/m² & 300g/m² combined for winter
But you can choose any combination of layers depending on how hot or cool you sleep.
The Hypnia duvet is also OEKO-TEX certified, meaning it’s tested against harmful substances in every fibre, thread, and fabric. 🧵
Hypnia duvet cover
The attached cover is made from 100% polyester and feels gentle and cosy against the skin.
The duvet is easy-care for those who want a fuss-free option and can be popped in the machine and washed at 40°C. 🧼
However, we also recommend using a regular duvet cover with your Hypnia duvet to help it last as long as possible.
The Hypnia Percale duvet cover is a great choice:
Is the Hypnia duvet good for hot sleepers?
We experienced a cosy yet breathable sleep with the Hypnia All Seasons duvet.
But that’s just our personal experience. 😅
To provide a more accurate review of the duvet's thermal capabilities, we tested it using our thermal camera and compared it to the luxury Brook + Wilde Four Seasons Cavendish duvet.
Take a look at these results, and then we’ll break them down for you:
|Av. temperature after 10 minutes
|Av. temperature after 3 mins heat dispersion
|Hypnia duvet with 200g/m² & 300g/m² layers
|Brook + Wilde Four Seasons Cavendish duvet with 4.5 & 8 tog layers
Both the Hypnia and Brook + Wilde duvets have a two-layer composition designed to be well-insulated while also being breathable.
The results indicated that the Hypnia duvet is the cooler option and the closest to the optimal sleeping temperature of 18°C. ✔️
The Brook + Wilde duvet has a slightly higher heat dispersion rate of 0.45°C than the Hypnia duvet at 0.3°C, indicating only a slight difference between their performances.
We were very impressed with these results, especially as the Hypnia duvet is available for a fraction of the cost of the Cavendish duvet.
Overall, our results show that the Hypnia duvet is a breathable option, and we recommend it to hot sleepers.
If you do find the two layers too warm, remember you can always separate them and sleep with just one layer. 🔁
Hypnia duvet sizes
The Hypnia duvet is available in standard UK sizes.
These sizes include:
- Hypnia single duvet: 135 x 200 cm (4'6" x 6'6")
- Hypnia double duvet: 200 x 200 cm (6'6" x 6'6")
- Hypnia duvet king size: 230 x 220 cm (7'5" x 7'2")
- Hypnia duvet super-king: 260 x 220 cm (8'5" x 7'2")
We recommend choosing a duvet that matches your bed size or one larger if you want it to overhang for a draped look.
Unfortunately, we were sent a single-size duvet instead of a double-size for our Hypnia duvet review.
We always recommend double checking you have opted for the correct size before placing your order. 📏
Hypnia duvet delivery & returns
The Hypnia duvet comes with free standard delivery and will be shipped within 48 hours. ⌛
Our Hypnia All Seasons duvet arrived promptly in a large cardboard box.
The duvet was also packed into a reusable fabric bag.
This makes it an excellent option for those who need to easily store a duvet or use it for travelling or sleepovers. 🚆
However, refolding and repacking the duvet into the bag is somewhat cumbersome, making it less suitable if you plan on doing this regularly.
Can I return the Hypnia duvet?
Unfortunately, the Hypnia duvet doesn’t include a sleep trial, but it does come with a 2-year guarantee against manufacturing faults. 🤞
Therefore, if you have any issues with your Hypnia duvet, such as seams coming apart or other material defects, you are protected by this warranty period.
To return your Hypnia duvet, you can contact the Hypnia team for assistance.
You’ll need your order number and the ability to upload images of the fault so Hypnia can deal with the problem efficiently.
Contact Hypnia UK
Customer service: To contact Hypnia UK directly for complaints, support, or queries, call them on 020 4571 7560, or pop them a message on their contact form. Hypnia support is available Monday - Friday from 10 am - 6 pm.
Registered office: Unit 106 Aviation Park West, Bournemouth Airport, Christchurch, Dorset, United Kingdom, BH23 6NW