Do mindfulness-based and CBT-I treatments differ in reducing depression during pregnancy while both improve insomnia?

In non-pregnant adults, both help sleep and mood, but CBT-I pulls ahead

The most direct comparison comes from a randomized trial in nurses with insomnia, delivered over the internet. Both mindfulness-based stress reduction and CBT-I reduced insomnia severity and depression scores within each group, so neither is inert for mood [1]. But between the groups, CBT-I produced significantly lower insomnia severity and significantly lower depression scores than mindfulness did, with the depression difference described as moderate in size [1].

A small pilot in people with chronic insomnia found a similar direction of travel: standard CBT-I and a version with acceptance-based components both improved insomnia severity, sleep quality, depression, and anxiety after four weeks of treatment [5]. That study did not include a mindfulness-only arm, so it supports the idea that CBT-I reliably touches mood, not that it beats mindfulness specifically.

Why CBT-I might move depression more than mindfulness does

One plausible explanation is that CBT-I targets the sleep problem more forcefully. In the nurses trial, the mindfulness program was tested as a possible substitute for CBT-I, and it failed to demonstrate that it was at least as good at reducing insomnia severity [1]. If depression in these participants is partly fed by poor sleep, a treatment that shrinks insomnia more would be expected to shrink depression more too. That is an interpretation, not something the trial measured directly.

Mindfulness did show a distinct signature: it raised scores on a mindfulness questionnaire substantially, while the depression advantage still went to CBT-I [1]. So the two treatments are not simply stronger and weaker versions of the same thing; they appear to work through somewhat different routes, with mindfulness building a skill that did not translate into a larger mood benefit in this group.

Evidence from other life stages points the same way, cautiously

A systematic review of psychological treatments during menopause found that CBT and CBT-I showed the most consistent effects, particularly for insomnia, while acceptance- and mindfulness-based approaches looked promising but more variable [3]. Most included interventions were associated with reductions in depressive and anxiety symptoms alongside sleep improvements [3]. The review's authors caution that the studies varied widely in format, outcome measures, and follow-up, and that no meta-analysis was possible, so the comparison between approaches rests on a narrative reading rather than a pooled number [3].

Separately, a trial in healthy community-dwelling adults found that both mindfulness meditation and exercise improved sleep quality [4]. That study did not test CBT-I or measure depression as a comparison, so it mainly confirms that mindfulness can affect sleep in people who are not patients — it does not tell us how mindfulness stacks up against CBT-I for mood.

Why pregnancy remains an open question

None of these studies enrolled pregnant women. The nurses trial and its protocol explicitly concern clinical nurses with insomnia [1][2], the menopause review concerns peri- and postmenopausal women [3], and the pilot concerns chronic primary insomnia patients [5]. The exercise-and-mindfulness trial even listed pregnancy or intention to become pregnant among its exclusions [4].

That matters because pregnancy changes both the sleep problem and the mood context: insomnia in pregnancy has different causes and constraints, and treatment options are weighed against fetal and maternal safety in ways these trials never had to consider. The protocol paper for the nurses trial framed internet-delivered mindfulness as a way to widen access to effective treatment [2], a practical argument that would apply equally in pregnancy — but the argument is about access, not about which treatment is better for depression.

So the practical answer for now: if the question is which approach better reduces depression while both improve insomnia, the best available evidence from non-pregnant adults favors CBT-I on both counts [1][5], with mindfulness a genuine but likely smaller contributor to mood. Whether that ordering holds during pregnancy has not been tested in these studies.

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