Sleep Disturbances
Sleep problems — insomnia, unrefreshing sleep, excessive daytime sleepiness — have many causes. Thyroid dysfunction can contribute in both directions: hyperthyroidism causes sleeplessness, hypothyroidism causes fatigue despite sleep.
Sleep issues are common and non-specific, so thyroid testing is one part of evaluation.
Last medically reviewed: 1 November 2025
Thyroid and sleep
Hyperthyroidism stimulates the nervous system — patients often report difficulty falling asleep, restless sleep, early waking and feeling wired despite exhaustion. Hypothyroidism causes heavy, unrefreshing sleep and excessive daytime sleepiness.
Sleep apnoea has also been associated with hypothyroidism in some studies.
Other causes
Insomnia has many causes — stress, anxiety, depression, poor sleep hygiene, caffeine, screen use, restless legs, sleep apnoea, medications. Daytime sleepiness suggests sleep deprivation, apnoea, or medical conditions.
Shift work and irregular schedules disrupt circadian rhythm independently of thyroid.
Evaluation
Thyroid testing is appropriate when sleep problems accompany other thyroid features — fatigue, weight change, temperature intolerance, anxiety — or when there is thyroid history.
If thyroid is normal, sleep evaluation continues — sleep diary, screening for apnoea, review of sleep hygiene and mood.
Frequently asked questions
Can hyperthyroidism cause insomnia?
Yes — the hyperadrenergic state makes it hard to wind down and sleep restfully. Sleep typically improves as thyroid function normalises.
Does hypothyroidism make you sleep more?
It causes fatigue and unrefreshing sleep — patients sleep but wake unrefreshed. Excessive daytime sleepiness can also occur.
Is thyroid-related insomnia permanent?
No — it resolves with treatment of the underlying thyroid dysfunction, though sleep habits may need separate attention.
References & further reading
This page is based on established medical knowledge and guidelines from authoritative sources. Always consult a qualified clinician for personal medical advice.
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