Treating insomnia eased back pain, not just the sleep

Pain and poor sleep feed each other: people with osteoarthritis and spinal pain very commonly sleep badly, and bad nights can in turn make pain harder to live with. Treatment usually targets the pain directly, with the sleep problem treated as collateral damage that will resolve once the pain does. This review asked the reverse question: if you treat the sleep problem itself, does sleep improve, and does the pain improve with it? That reframing matters for the large number of people whose back pain and insomnia arrive as a package.

The authors searched seven databases from inception to July 2017 for randomised trials of sleep interventions in people with osteoarthritis or spinal pain, requiring at least one sleep outcome and one health-related outcome. Twenty-four studies made the cut from 1445 unique records: sixteen in spinal pain, seven in osteoarthritis and one in a mixed population. Interventions ranged from established approaches, meaning cognitive behavioural therapy and sleep medication, to a variety of others, with programmes lasting four to ten weeks. Thirteen studies rated as moderate to high quality, and results for pain and sleep quality were pooled.

Established sleep interventions improved sleep in both groups: insomnia severity fell by 6.78 points on a 28-point scale for people with low back pain and by 2.41 points for those with osteoarthritis. The pain results split. For low back pain, pain scores dropped by 12.77 points on a 100-point scale, a clear improvement over control conditions. For osteoarthritis the pain change was 2.32 points and did not reach significance, so treating sleep helped those participants rest but did not clearly ease their joints.

The finding strengthens the case that sleep and pain are entangled rather than one simply following the other, at least for low back pain. It extends earlier work by pooling across conditions and showing the benefit is not uniform: osteoarthritis sleep improved while osteoarthritis pain did not. The studies disagreed with each other enough that the authors ran subgroup and sensitivity analyses, and they are explicit that more vigorous trials are needed. Why back pain responded where osteoarthritis did not remains an open question.

If you live with low back pain and your sleep is poor, this is evidence that the insomnia deserves attention in its own right, with a realistic prospect that pain eases as sleep improves. For osteoarthritis the expectation should be narrower: better sleep, without a clear knock-on benefit for the pain itself. Either way, the research pushes back against the idea that poor sleep is merely a symptom to be waited out until the pain is fixed.