Sleep Problems and Hormones

Trouble falling asleep, staying asleep, or feeling rested can prompt questions about hormones. Some hormone systems do affect sleep, but sleep problems have many causes, and most are not driven by a hormone disorder. This page explains the possible links and why a clinician's assessment matters.

How sleep can relate to hormones

Sleep is regulated by the brain and body clock, and several hormones follow daily rhythms that interact with it. When a hormone system is disrupted, sleep can be affected, and poor sleep can in turn influence how other systems behave. The relationship runs in both directions, which is part of why sleep problems can be hard to untangle and are best viewed as a clue rather than a diagnosis.

Which hormones and conditions may be involved

A clinician may consider several possibilities, none diagnosable from sleep symptoms alone:

• Thyroid hormones. An overactive thyroid can be associated with difficulty sleeping and restlessness; an underactive thyroid can affect energy and sleep quality.
• Cortisol. Cortisol normally follows a daily rhythm, and conditions that disturb it can affect sleep.
• Sex hormones. Hormonal changes around menopause, including night sweats, are sometimes linked with disturbed sleep.
• Blood sugar. Swings in blood sugar overnight can occasionally disrupt sleep.

Blood tests a clinician might consider

Testing follows the overall assessment, not the symptom alone. Depending on the picture, a clinician might consider:

• TSH and other thyroid tests to assess thyroid function.
• Cortisol testing, sometimes timed, in selected situations.
• Sex hormone tests when a reproductive cause is being considered.
• Blood glucose or HbA1c where relevant.

You can read about individual tests in our blood tests section and the messengers in the hormones section, with related diagnoses in the conditions section. Poor sleep often overlaps with fatigue and mood changes, which are worth mentioning to your clinician.

Non-hormonal causes to keep in mind

Most sleep difficulties relate to factors other than hormones. Common causes include stress and worry, irregular sleep schedules, screen use and light at night, caffeine, alcohol, certain medicines, pain, depression and anxiety, and sleep disorders such as insomnia and sleep apnoea. Sleep apnoea in particular is common and treatable, and it can cause daytime tiredness that resembles a hormone problem. Because these factors are so frequent, a review of sleep habits and overall health usually comes first.

When to see a clinician

Seek advice when sleep problems are persistent, affecting your daytime functioning, or accompanied by loud snoring, pauses in breathing, or other symptoms. A clinician can review your sleep, mood, and health, and decide whether any testing or a sleep assessment is appropriate, interpreting results in context. This is more reliable than self-testing. This page is educational and is not a substitute for personalised medical advice.