News · Sleep
Sleep therapy eased insomnia during breast cancer chemotherapy but light glasses did not, in 219 women
Insomnia is common during chemotherapy and often untreated. An Australian trial tested two brief fixes side by side: a short course of sleep therapy helped, bright light glasses mostly did not.
- A randomized trial in 219 women having chemotherapy for breast cancer at five Australian hospitals.
- They got six weeks of sleep therapy, bright light glasses, both, or sleep advice alone.
- Brief sleep therapy improved insomnia by about 2 points on a 28-point scale; it did not ease fatigue.
- Light glasses made no overall difference, though they helped in women with advanced cancer, an early hint only.
- The trial was not blinded and many women dropped out during follow-up.
Cancer treatment brings a long list of side effects, and poor sleep is one of the most common and least treated. Women having chemotherapy for breast cancer often describe nights of lying awake, followed by days of heavy fatigue, and both can drag on long after treatment ends. The standard sleep treatments were largely tested in people who were not in the middle of chemotherapy.
A trial published in JAMA Network Open compared two brief options in 219 women during chemotherapy: a short course of sleep therapy, and glasses that shine bright light toward the eyes. The sleep therapy helped insomnia. The light glasses did not, except possibly in women with advanced cancer.
What insomnia is
MedlinePlus describes insomnia as a common sleep disorder, explaining that if you have it, you may have trouble falling asleep, staying asleep, or both. For most people it passes, but for some it becomes a long-term problem, and serious illness and its treatment are common triggers.
The authors describe the gap they set out to fill: to date, no randomized clinical trial has evaluated the use of cognitive behavior therapy for insomnia and bright light therapy both alone and in combination, and few have tested either during chemotherapy.
How the sleep and light trial worked
The design tested both treatments at once. Women were assigned to sleep therapy alone, light therapy alone, both together, or sleep advice alone, with 55 randomized to CBT-I, 55 to BLT, 52 to CBT-I plus BLT, and 57 to SHE. CBT-I is a structured talking therapy for sleep; the light therapy used glasses shining bright light at the eyes; SHE was basic sleep hygiene advice, which everyone received.
Each program lasted six weeks and was deliberately brief: a single one-to-one session, regular emails and a midpoint phone call. The main measures were how bad insomnia and fatigue felt, reported by the women themselves.
What happened to sleep and fatigue
Sleep therapy made a measurable difference to sleep. Insomnia symptoms improved more in the CBT-I groups compared with the non-CBT-I groups, by about 2 points on a 28-point scale. It did not ease fatigue.
The light glasses did not help overall. The BLT groups did not differ in insomnia symptoms or fatigue symptoms from women who did not use them. The one exception was in women whose cancer had spread, where light therapy improved both sleep and fatigue, but that was an exploratory look at a small subgroup, the kind of finding that needs its own trial before anyone relies on it.
Why a brief sleep therapy result is useful
The sleep therapy here was about as light-touch as it gets: one session and some emails. That it still improved insomnia during chemotherapy suggests a practical option for patients who have little time or energy for a full course, and one that hospitals could deliver without much extra staff.
The light therapy result is useful too, in the other direction. Light glasses are sold widely for sleep and energy, and this trial, in a group that might have been expected to benefit, found no overall effect. Fatigue, the other big complaint, was not helped by either approach.
What an unblinded sleep trial cannot settle
The authors list the limits. The trial was unblinded (blinding is usually not feasible for behavioral interventions), so women knew which treatment they had, which can color self-reported symptoms. There was no objective measure of how much they actually used the glasses or followed the sleep advice.
They also note that substantial dropout, especially during follow-up, compromises the internal validity of our findings. And the results apply to women with breast cancer; the authors see no strong reason they would differ in other cancers, but that was not tested.
What this changes for sleep during chemotherapy
For patients, the message is that sleep problems during chemotherapy are treatable and worth raising. A short course of sleep therapy improved insomnia even in the middle of treatment, and the care team can often arrange it.
Light glasses, on this evidence, are not worth buying for most people having chemotherapy. Whether they help women with advanced cancer is an open question that a dedicated trial would need to answer.
People also ask
What did the study find?
Insomnia symptoms improved more in the groups receiving cognitive behavior therapy for insomnia than in those that did not (Insomnia Severity Index mean difference -2.19 points), but fatigue did not. Bright light therapy did not change insomnia (mean difference -0.88) or fatigue overall. In an exploratory subgroup of women with metastatic breast cancer, light therapy improved both.
What is cognitive behavior therapy for insomnia?
A structured talking treatment for sleep, usually called CBT-I, that changes the habits and thoughts that keep insomnia going, for example by setting regular sleep times and not lying awake in bed. It is the recommended first treatment for chronic insomnia.
What is bright light therapy?
Exposure to bright light at set times, here through glasses that shine light toward the eyes, to help reset the body clock.
Why test this during chemotherapy?
Chemotherapy often disrupts sleep and causes fatigue, and both can linger. Few trials had tested sleep treatments during chemotherapy itself, when patients may have little time or energy for lengthy programs.
How big is a 2-point improvement?
Modest. The insomnia scale runs from 0 to 28, and this was a short, light-touch version of the therapy. Fuller programs often produce larger improvements.
Should people having chemotherapy try these?
Sleep problems during cancer treatment are worth raising with the care team, who can refer to sleep therapy. Light therapy is not supported for most patients by this trial. This is general information rather than medical advice.