Why don't eggs help sleep the way some wellness content suggests?

Eggs contain tryptophan, which is a precursor to serotonin and melatonin. The theory is that eating eggs in the evening provides a tryptophan boost that supports melatonin production and sleep onset. The Deakin University trial tested this directly in perimenopausal women and found no meaningful sleep improvement. The likely reason is that tryptophan from whole food competes with other large neutral amino acids for transport across the blood-brain barrier — the net melatonin effect is much smaller than the mechanism implies. This doesn't mean eggs are bad for sleep; they aren't. It means sleep in perimenopause is a more complex problem than any single food can address.

What does actually help sleep in perimenopause?

It depends on what is driving your specific disruption. If vasomotor symptoms (hot flushes, night sweats) are waking you, menopausal hormone therapy (MHT) has strong evidence for reducing that burden — and through it, sleep. If sleep disruption has become self-sustaining through anxious vigilance and clock-watching, cognitive behavioural therapy for insomnia (CBT-I) is the first-line treatment with durable effects, recommended by RACGP. If lifestyle factors — alcohol, inconsistent sleep timing, low physical activity — are contributing, addressing those whole-of-lifestyle has evidence. Your GP can help identify which driver is dominant for you.

The evening egg study and perimenopause sleep

What just happened

Deakin University’s Institute for Physical Activity and Nutrition published results from a nine-week randomised crossover trial asking a specific question: does eating eggs in the evening — to deliver tryptophan as a melatonin precursor at the point in the day where it might theoretically support sleep onset — improve sleep in perimenopausal women?

The RACGP covered the result this week: mostly no.

Twenty-two perimenopausal women, including those with pre-existing sleep disturbance, completed the trial. Each participant experienced both conditions — evening egg consumption and control — in sequence. Evening egg intake did not meaningfully alter sleep duration, efficiency, or subjective quality compared with the control. A small improvement in backache and joint pain was observed in the egg-consumption arm — plausible given eggs’ nutrient profile, including omega-3 fatty acids and vitamins D and B12 — but this was not the primary outcome and cannot be interpreted robustly from 22 participants.

The trial is a useful corrective to a pattern of wellness content that circulates widely in perimenopause spaces. Food-as-sleep-fix framing has a certain logic: tryptophan → serotonin → melatonin → better sleep. The chain is biochemically real. The clinical effect, in 22 perimenopausal women over nine weeks, was not meaningful.

The both-and

The finding that eggs don’t fix perimenopause sleep is less interesting than understanding why perimenopause disrupts sleep at all — and where the evidence for change actually lives. The trial clarifies the wrong question, which is useful, because the right question is more answerable.

Why perimenopause disrupts sleep

Up to 60% of women experience sleep difficulties during perimenopause. The drivers are multiple and usually overlapping.

Oestrogen decline alters thermoregulation — vasomotor symptoms (hot flushes, night sweats) frequently disrupt sleep architecture. Progesterone has direct sedating properties, and as progesterone declines through the perimenopause transition, the slow-wave deep sleep that progesterone supports deteriorates. Cortisol patterns shift, with the HPA axis becoming less suppressed at night, creating a background arousal state that shortens sleep onset and fragments continuity.

Then there is the context load: perimenopause frequently coincides with peak life complexity — work demands, adolescent children, ageing parents, relationship renegotiation, the first clear recognition that the body is changing on its own schedule. Anxiety and sleep are bidirectionally linked; it is often not possible to say which is driving which.

A tryptophan-rich food eaten in the evening addresses none of these drivers. It does not reduce vasomotor frequency. It does not restore the slow-wave architecture that declining progesterone was supporting. It does not dampen HPA-axis arousal or reduce background anxiety.

Even if the tryptophan pathway functions as described, tryptophan from whole food must compete with other large neutral amino acids for transport across the blood-brain barrier — the net melatonin effect is substantially smaller than the mechanism implies. The gap between “eggs contain tryptophan” and “eggs improve perimenopause sleep” turns out to be very large indeed.

What the trial does and doesn’t establish

The Egg Pro-Sleep PM trial enrolled 22 participants in a nine-week randomised crossover design. Twenty-two is a small sample, and the null finding — no meaningful sleep improvement — is what was predicted by anyone who understands the biology of perimenopause sleep disruption. The trial is not wrong to have run. It provides direct evidence in the population where the food-timing claim was circulating.

What the trial does usefully establish: eating eggs in the evening does not disrupt sleep, even in women with pre-existing sleep disturbance. The common concern that evening eating interferes with sleep does not apply to eggs in this population. That is the more modest but still practically useful finding.

The commentary from RACGP correctly notes: “Single foods cannot resolve complex sleep disturbances,” and recommends a whole-of-diet approach as the appropriate frame for nutritional contributions to sleep.

What actually has evidence

If vasomotor symptoms are the dominant driver — if hot flushes or night sweats are waking you — the treatment target is the vasomotor symptoms, and menopausal hormone therapy (MHT) has strong evidence for reducing that burden. For most perimenopausal women, MHT is safe; the risk profile is considerably more nuanced than 2002 Women’s Health Initiative coverage suggested, and the evidence base has moved substantially since then.

If sleep disruption has become self-sustaining through anxious vigilance and catastrophising about wakefulness, cognitive behavioural therapy for insomnia (CBT-I) is the first-line treatment with durable effects — recommended by RACGP and superior to sleep medications in the long run because it changes maintaining factors rather than suppressing symptoms. CBT-I is available via telehealth through several services that bulk-bill under the Better Access to Mental Health Care programme.

If the disruption is diffuse — alcohol use, inconsistent sleep timing, low physical activity, poor whole-diet quality — addressing those whole-of-lifestyle factors has supporting evidence, and eggs are a reasonable part of that picture. But eggs are not the point.

2 cents

Two specific steps worth taking.

If perimenopause is disrupting your sleep and you have not yet had an explicit clinical conversation about MHT: that conversation is worth having. Whether MHT is appropriate for you depends on your individual history and risk factors, and your GP can work through that with you. The key word is “conversation” — not a request for a script, but a discussion of whether the option fits your situation.

If hormonal treatment is not appropriate for you or not what you want, ask your GP specifically about CBT-I referral. It has a stronger long-term evidence base than any medication for chronic insomnia, and the effects are durable rather than tolerance-dependent.

Eggs in the evening are fine. They are a good source of protein, and whole-diet protein adequacy genuinely does matter in midlife. But they are not a sleep intervention.

This is general health information and does not constitute individual clinical advice.

Verdict

Verdict: maybe — watch this.

The trial is too small (n=22) to be definitive, and the null finding is broadly expected: hormonally-driven sleep disruption in perimenopause is not a tryptophan deficiency problem. The study is worth knowing about because it cleanly separates a plausible mechanism from a real clinical outcome in this population. If your sleep is poor in perimenopause, the path with evidence runs through MHT and CBT-I — not food timing. Both conversations belong in a GP consult, not a wellness newsletter.