To the Editor In a cross-sectional study, Koopman-Verhoeff et al¹ observed that there was an association between subjectively reported and objectively estimated sleep problems and melatonin use in school-aged children. Their observation highlights the importance of close and enhanced monitoring of currently freely available melatonin because an estimated 1 in 17 children are likely to take melatonin at least once a week.¹ However, we have 2 major methodological concerns.

中文翻译：

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学龄儿童的睡眠问题和褪黑激素的使用。

致编者在一项横断面研究中，Koopman-Verhoeff等人¹观察到，在主观报道和客观估计的睡眠问题与学龄儿童褪黑激素的使用之间存在关联。他们的观察强调了密切和加强对目前免费提供的褪黑激素的监测的重要性，因为估计有17名儿童中有1名可能每周至少服用一次褪黑激素。¹但是，我们有2个主要的方法论问题。