Is TSH Schilddrüse useful for sleep?

The question of whether TSH (thyroid) is useful for sleep cannot be answered from the provided context, which contains no information about TSH or thyroid. In general medicine, thyroid hormones influence metabolism and thus can indirectly affect sleep – hyperthyroidism (low TSH) may cause insomnia, hypothyroidism (high TSH) may cause fatigue. However, TSH alone is not a specific sleep biomarker. The context focuses on DNA tests for nutrition and microbiome, not thyroid diagnostics. Therefore, its utility for sleep is limited without further clinical evaluation. Evidence is rated as 'unclear' because no direct studies or sources from the context support a link.