Knowledge base
Glossary
From deep pressure to CE marking: here you'll find the terms that come up in our articles, explained briefly and in plain language. If someone says weighted plush toy, weighted soft toy or weighted teddy, they usually mean a weighted stuffed animal too.
A
- Actigraphy
An actigraph records how much you move. From that, researchers estimate how long and how restlessly someone sleeps. It is less precise than a sleep study in hospital, but more objective than a questionnaire. In studies with weighted blankets, people sometimes reported far fewer sleep problems, while actigraphy showed little or no difference.
- ADHD
ADHD is a diagnosis made by a doctor or psychologist, in children and in adults. In a well-designed Swedish study, children with ADHD slept on average about 8 minutes longer under a weighted blanket of 6 to 10 kg; they did not fall asleep faster. A weighted stuffed animal is much lighter and is not a treatment for ADHD.
- Autism
Many autistic children and adults experience sensory input differently from most people: some sounds or touches are too much, while firm pressure actually feels pleasant to some. In the largest study of weighted blankets in autistic children, the children did not sleep measurably better, although children and parents did like the blanket more. Weighted vests were not shown to be effective in autism. So always let the person decide for themselves whether pressure feels pleasant.
C
- CE marking
A weighted stuffed animal usually falls under the European rules for toys. In that case, a visible, legible CE marking must be on the product, a label or the packaging. CE is not a quality mark: with it, the manufacturer itself declares that the product meets the rules. The Belgian Federal Public Service Economy advises never to buy toys without a CE marking.
- Comfort object (transitional object)
Many young children have a favourite comfort object: in a large twin study, a third of three-year-olds had one. Winnicott described it in 1953 as a ‘transitional object’ and saw it as a normal part of development. Adults sometimes have a comfort object too, and that in itself is not a problem. That comfort doesn't depend on weight: an ordinary stuffed animal can play that role too.
Where does the idea of the weighted stuffed animal come from?
D
- Deep pressure
Deep pressure is firm, even pressure on a larger part of the body, which is different from a light touch. The idea became well known through Temple Grandin, who described her ‘squeeze machine’ in 1992. The theory is that such pressure helps the body to calm down, but this has only been looked at in small studies. A weighted stuffed animal gives much less, and more local, pressure than a heavy blanket.
E
- EN 71
Manufacturers use EN 71 to show that their toys meet the European toy rules. For soft, stuffed toys, the requirements include the strength of the seams and the cleanliness of the filling, also after washing according to the instructions. The standard itself is not free to view. If in doubt, ask the seller whether the product has been tested to EN 71.
G
- Glass beads
Glass beads are heavy for their size, so a weighted stuffed animal doesn't need to be very big. They can sit in an inner bag or in compartments, so the weight stays evenly spread. Because they are small particles, the seams must be strong: if a seam tears open, a child could swallow or inhale them. So check the seams regularly.
- Grounding
Grounding is a way to reconnect with your body and your surroundings during panic, anxiety or flashbacks. A well-known example is the 5-4-3-2-1 exercise, in which you name things you see, hear and feel. For some people, holding something heavy or resting it on their lap can be something tangible to hold on to. There has been no research into weighted stuffed animals as an aid to grounding.
H
- High sensitivity (HSP)
People who are highly sensitive often feel overwhelmed more quickly by busy places, noise or emotions. HSP stands for highly sensitive person. High sensitivity is a trait, not a disorder or a diagnosis. Many highly sensitive people enjoy a quiet moment with something soft and heavy on their lap. Try out for yourself what suits you.
M
- Melatonin
In a small lab study with 26 healthy young adults, melatonin in saliva rose more in the evening under a heavy blanket (about 12% of body weight) than under a light blanket. Sleepiness and sleep duration did not change, and neither did oxytocin and cortisol. What a stuffed animal of 1 to 2 kg does here has yet to be studied.
- Meta-analysis
A meta-analysis is often part of a systematic review. By combining studies, you can see small effects more clearly. A 2024 meta-analysis of eight studies with weighted blankets, for example, found a small effect on anxiety and no clear effect on insomnia. Weak studies taken together still don't add up to strong evidence.
O
- Occupational therapist
An occupational therapist looks at what you want to be able to do in daily life, at home, at school or at work, and works with you to find solutions and aids. Professional bodies for occupational therapists, such as the one in the United Kingdom (RCOT), advise a personal assessment before someone starts using a weighted aid. An occupational therapist can help you judge whether a weighted stuffed animal suits you or your child and what to look out for.
P
- Parasympathetic nervous system
Your autonomic nervous system regulates things like your heart rate and breathing without you having to think about it. The sympathetic part gets your body going when you're under stress; the parasympathetic part helps you calm down again. There is a theory that deep pressure activates the parasympathetic part. Small studies in adults under stress, such as at the dentist, point in that direction, but the mechanism has not been established.
- Placebo
If you expect something to help, you can genuinely feel better, even if the remedy itself does nothing. That's why researchers compare a treatment with a placebo. In studies of weighted blankets, a light blanket often serves as the comparison, for example one of 1.5 kg or 2.3 kg. That is about the weight of a weighted stuffed animal.
- Proprioception
Thanks to proprioception, you know where your arms and legs are and how you're moving without looking. With weighted aids, the idea is that pressure and weight strengthen this sense of your body and so give you something to hold on to. That is a plausible explanation, but it has not been established scientifically.
R
- Randomised controlled trial (RCT)
Because people are assigned by lot, the groups are as similar as possible, so differences afterwards are likely to be caused by the treatment. That makes an RCT one of the strongest forms of research. With weighted products there is a problem, though: participants feel the weight and so often know which group they are in. That can especially affect outcomes that people report themselves.
- Restrictive measure (restraint)
In a care facility, a weighted aid can be a restrictive measure, for example if someone can't remove it themselves or resists it. The Dutch aid guide Vilans Hulpmiddelenwijzer states that within an institution, a weighted blanket can be a restrictive measure. A weighted aid must never be used as a punishment or to keep someone still. In care settings, always discuss it with the care team.
S
- Sensory integration
In sensory integration therapy, an occupational therapist works on personal goals according to fixed principles. There are encouraging research results for this therapy in autistic children. Separate sensory aids, such as weighted vests, are something else; the evidence for them is weak. The American Academy of Pediatrics (AAP) describes the evidence for sensory therapies as limited.
Where does the idea of the weighted stuffed animal come from?
- Sensory overload
Sensory overload happens when sound, light, busyness or impressions pile up. Children may then become tearful or, on the contrary, overactive; adults tired, short-tempered or absent-minded. A quiet place with less sensory input is often the first step to recovering. Some people find deep pressure pleasant at such a moment, such as a weighted stuffed animal on their lap; others don't.
- Sensory processing
Everyone takes in sensory input through their senses all day long. How strongly you experience it and how quickly you recover from it differs from person to person. Differences in sensory processing are often mentioned in connection with autism and high sensitivity. A ‘sensory processing disorder’ is not an official diagnosis; the American Academy of Pediatrics (AAP) advises against using that term as a diagnosis.
- Systematic review
In a systematic review, researchers decide in advance how they will search and which studies count. That makes it less likely that they only pick favourable studies. A review is only as strong as the studies in it, and for weighted blankets those are mainly small studies. There is no such overview for weighted stuffed animals yet, because the research is still at an early stage.
W
- Weighted blanket
Weighted blankets have been studied much more than weighted stuffed animals. In studies they often weighed 6 to 8 kg or more. Adults often reported that they slept better or felt less anxious, while measured sleep changed little. A stuffed animal of 1 to 2 kg gives much less pressure, so those results can't simply be applied to it.
- Weighted lap pad
A weighted lap pad is used in the same way as a weighted stuffed animal on your lap. Paediatric occupational therapists in the UK recommend it for short periods and not at night, and the child must be able to remove it themselves. As with weighted stuffed animals, research into lap pads is still at an early stage.
- Weighted vest
In research, weighted vests usually weigh 5 to 10% of body weight. They have been studied several times in autism and were not shown to be effective. So only use a vest after talking it through with an occupational therapist.
- Wet zorg en dwang (Wzd)
The Wzd describes when care is involuntary, for example when someone resists a measure that restricts their freedom of movement. In that case, a step-by-step plan and a record in the care plan are required. The law doesn't mention weighted blankets or weighted stuffed animals by name, but in a Dutch care facility a weighted aid can fall under it. If in doubt, talk to the person responsible for the care or the Wzd officer; different rules apply in Belgium. Rules differ from country to country, so elsewhere, ask your own care team.