Does Sermorelin Improve Sleep in Older Adults?

Your father is 71 and wakes three or four times every night. A men’s clinic flyer on the fridge says sermorelin can “bring back the deep sleep you had at 30.” Is there human evidence that sermorelin, or the hormone it copies, makes older people sleep more deeply?

Only a thin and mixed record, and none of it tests sermorelin for sleep. Sermorelin is a shortened lab-made copy of GHRH, the brain hormone that signals the pituitary to release growth hormone. In 1990s sleep-lab experiments, natural GHRH given to healthy older volunteers for a single night brought small changes, such as fewer awakenings in one study and more deep and dream sleep in another. The only test of repeated use, in two older men, found no improvement. No study enrolled people with insomnia or followed anyone for weeks.

Why sleep researchers looked at GHRH at all

Growth hormone is released mostly in the first deep stretch of the night, so scientists asked whether the hormone that triggers it also shapes sleep. In 1993, Kerkhofs and colleagues in Brussels gave healthy young men GHRH through a vein at different points in the night. Given early, it raised dream sleep but left deep sleep unchanged. Given in the last part of the night, when sleep is naturally lighter, it cut time awake and increased deep sleep almost tenfold.

Timing mattered in the other direction too. A 1997 Munich study by Schier and colleagues gave GHRH to seven young men in the early morning hours. Growth hormone rose, but sleep measures barely moved. So even in young adults the effect depended on when the hormone arrived.

What happened when older volunteers got GHRH

Guldner and colleagues tested 13 healthy adults with an average age of about 69, comparing GHRH with a dummy infusion given during the night. Volunteers woke up less often and their first stretch of non-dream sleep lasted longer. The authors also wrote that GHRH promoted sleep in older people much less than it does in younger ones.

A 1999 German study by Perras and colleagues used a nasal spray instead. In a double-blind crossover design, 12 young and 11 older healthy men received GHRH or a placebo spray before bed. GHRH raised deep and dream sleep, mainly in the second half of the night, and the effect did not depend on age. It also changed nighttime cortisol and growth hormone patterns. Each comparison lasted one night in a lab.

The only test of repeated use found no gain. Murck and colleagues asked whether repeated GHRH over about two weeks would restore younger-looking sleep. Only two older men took part. After the repeat course, the sleep period and deep sleep were shorter than on the first GHRH night, and the authors concluded it had no sleep-improving effect. A separate 1997 trial of a sermorelin-type drug in older adults, covered in an earlier Everyday Brief story, also found that sleep quality did not change.

What this means for a parent who wakes at 3 a.m.

These experiments used natural GHRH rather than sermorelin, enrolled healthy volunteers rather than people with insomnia, and mostly measured brain waves for one night. They cannot show that any product helps an older person feel rested. Sermorelin sold online as a research chemical is labeled not for human use, and nothing here supports using it.

Frequent waking in later life has many causes worth checking. MedlinePlus notes that most long-lasting insomnia is a symptom of something else, such as a medical condition, a medicine, another sleep disorder, caffeine, or alcohol, and that cognitive behavioral therapy can help chronic insomnia. A doctor visit that reviews medicines, bathroom trips, pain, and possible sleep apnea is a better next step than a flyer promise. Not medical advice.

Sermorelin and Deep Sleep After 60: What 1990s Sleep-Lab Studies Found

Why sleep researchers looked at GHRH at all

What happened when older volunteers got GHRH

What this means for a parent who wakes at 3 a.m.

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