Myths vs facts: TSH and Schlaf

The relationship between TSH (thyroid-stimulating hormone) and sleep is often misunderstood. A common myth is that elevated TSH alone indicates hypothyroidism and causes sleep problems. In fact, TSH secretion follows a circadian rhythm: it peaks at night and declines during the day. Sleep deprivation or disruption can shift this rhythm, leading to higher TSH levels without underlying thyroid disease. Conversely, untreated hyperthyroidism (low TSH) can impair sleep. Importantly, a single TSH value without T3, T4, and clinical symptoms is insufficient for diagnosis. Evidence is based on population studies and physiological mechanisms, not RCTs. Caveat: Do not self-medicate; consult an endocrinologist if sleep issues and abnormal TSH persist.