The Sleep Trouble Was in the Questionnaires

What the research found

A 2022 study in *Frontiers in Psychology* set out to answer a narrow question: do children who are unusually sensitive to sensory input sleep differently from children who are not? The researchers, led by Amy Hartman, recruited 55 children between the ages of six and ten. Using a standardised questionnaire called the Sensory Profile-2, they sorted the children into two groups: 22 with marked sensory sensitivities and 33 without. Then they asked parents and children to describe how sleep actually went.

The gap between the groups was large. On the main parent-completed measure, the Children’s Sleep Habits Questionnaire, children with sensory sensitivities scored substantially higher on sleep disturbance. In the language of statistics, the difference had an effect size of roughly 1.1. An effect size describes how far apart two groups are relative to the spread within them; anything above about 0.8 is conventionally called large. This one was large by a comfortable margin.

Three specific problems stood out. Children with sensory sensitivities showed more bedtime resistance, the struggle over going to bed at all (effect size 0.83). They showed more sleep anxiety, worry and fear around sleeping (0.79). And they took longer to fall asleep once in bed, a measure called sleep onset delay (0.95). These are the three findings the hint pointed to, and the paper confirms them with numbers.

The children’s own reports agreed with their parents’. On a separate self-report questionnaire, 64 percent of children with sensory sensitivities said they had trouble sleeping, against 21 percent of the children without. That is one important detail: the two groups did not simply have anxious parents interpreting things differently. The children themselves noticed the difference too.

It is worth being precise about what kind of study this is. This was a community sample of children selected for sensory sensitivity, not a sample of children with a formal autism diagnosis. Sensory sensitivities are a core feature of autism, which is why the finding matters here, but the study does not claim to be about autistic children specifically. It is about a trait, not a diagnosis.

What it means for you and your child

If bedtime is a nightly battle in your home, this study offers a small measure of validation. The pattern is real and it is measurable. A child who resists bed, lies awake anxious, and takes an age to drop off is not being difficult for its own sake. For a child whose nervous system registers the hum of the house, the texture of pyjamas, or the light under the door more intensely than most, the quiet, still, dark conditions of sleep are not automatically comforting. They can be the opposite.

But the study’s honesty about its own limits should shape how much weight you give it. The most important caveat is how sleep was measured. Everything here comes from questionnaires: what parents reported and what children reported. No child wore an actigraph, the wrist device that estimates sleep from movement, and none underwent a sleep study. So the research tells us that families experience and perceive more sleep trouble. It does not yet tell us, minute for minute, that these children objectively sleep less or worse. The authors say this plainly and call for future work using objective measures.

The second limit is causation. This is a snapshot taken at one moment, comparing two groups. It cannot show that sensory sensitivity causes poor sleep. The arrow could run the other way, or partly both ways. Poor sleep frays anyone’s tolerance for sensory input; a tired child is a more sensitive child. Most likely the two feed each other. A single study of this design cannot untangle that loop, and it does not pretend to.

The sample was also small and not diverse. Fifty-five children, drawn from particular places, collected during the pandemic in late 2021, and lacking racial and ethnic breadth. That does not make the finding wrong. It does mean it should be held as a strong signal from one careful study, not as a settled fact about all children.

For practical purposes, the useful takeaway is one of framing. If your child is sensory-sensitive and sleep is hard, the two are plausibly connected, and the connection is more about anxiety and the wind-down before sleep than about the sleep itself. That points attention toward the hour before bed: the light, the sound, the fabric, the sense of safety. None of that is a treatment claim, and this study tests no interventions. But it suggests where a thoughtful conversation with a paediatrician or occupational therapist might sensibly begin, and it gives you the numbers to show you are not imagining the problem.