It can, and it is one of the most overlooked causes. The fall of progesterone and estrogen in perimenopause and the fall of testosterone in men change the architecture of sleep. If the insomnia started alongside hot flashes, irritability or falling libido, the hormonal clock is the prime suspect.
There is a pattern that repeats in my practice: the person slept well their whole life and, between 38 and 50, sleep falls apart. It was not the mattress that got worse. It was the hormonal environment the brain sleeps in.
In Reactiva's insomnia data, with 267 responses, the average age of respondents was 46, with recurring answers that sleep got worse "after 30" or "after 40". 8 in 10 were women. That age and sex profile is no accident: it is the perimenopause window.
How hormones hold (or destroy) sleep
- •Progesterone has a direct calming effect on the brain. It is one of the first hormones to fall in perimenopause, years before periods stop. Light sleep and waking at 3 am are the classic signature of that drop.
- •Estrogen takes part in regulating body temperature. Its fall produces the hot flashes and night sweats that fragment sleep.
- •Low testosterone, in men and women, shows up alongside worse sleep, fatigue and falling libido. In our survey, more than half of poor sleepers also reported falling libido, the two symptoms travel together because the root is shared.
- •Cortisol completes the picture: when sex hormones fall, the stress axis becomes more reactive, and the night turns into a state of alert.
The common mistake
Treating this insomnia with a sleep aid is bailing water: it sedates the brain one night and hands the problem back the next, because the hormonal environment stays the same. And the "normal" routine panel does not look at progesterone, estradiol, free testosterone or late-night salivary cortisol at the right moment of the cycle.
What makes sense to investigate
Estradiol, progesterone and testosterone according to the phase, TSH and free T4, late-night salivary cortisol when excess is suspected, all interpreted together with the history: when it started and what changed in the body alongside it (weight, mood, libido, cycle). Insomnia that arrives at the turn of 40 is rarely a "sleep" problem. It is a system problem, and sleep is the alarm.
Dr. Diego Rios · CRM-PI 8347 (Brazilian medical license)
Creator of the Reactiva Method. Five postgraduate degrees: Family Medicine, Endocrinology and Metabolism, Nutrology, Sports Pharmacology and General Ultrasonography.
The answer is not one more isolated lab test. It is reading the system.
Medicine is one. The body does not divide itself into specialties: the model does. When each symptom goes to a different office and each doctor sees one piece, you spend years circling between referrals, holding reports and missing answers. In that back-and-forth, you lose time and health.
Precise diagnosis and treatment come from the opposite path: understanding everything and going deep into one patient. Sleep, hormones, weight, energy and mind interpreted together, because that is how the body works.
Dr. Diego Rios, CRM-PI 8347
Educational content. It does not replace individual medical evaluation and is not a prescription. Patient care is provided in Portuguese.