Is CLOCK useful for Schlaf?

The CLOCK gene is a core component of the circadian clock and influences sleep-wake timing. Certain variants (e.g., rs1801260) have been associated with delayed sleep phase, longer sleep onset, and reduced sleep efficiency in some studies. However, effect sizes are modest, and lifestyle factors like light exposure, meal timing, and stress play a larger role. A DNA test for CLOCK can indicate a genetic tendency but is not diagnostic for sleep disorders. Evidence is primarily mechanistic and associative (GWAS, candidate gene studies); robust clinical trials demonstrating direct benefit from genotyping are lacking. For sleep issues, prioritize sleep hygiene (consistent schedule, limited evening blue light) and consult a physician if problems persist. Genetic testing alone should not guide treatment decisions.