将以下段落进行优化修改，使其更加流畅和易读。


这是一篇摘自学术期刊的段落：
Although sleep disorders are common in patients with psychiatric disorders, few studies have compared the risk of developing sleep disorders among individuals with different psychiatric disorders. In this study, we compared the risk of developing sleep disorders in patients with major depressive disorder, bipolar disorder, and schizophrenia.
Sleep disorders are prevalent in patients with psychiatric disorders, but few studies have compared their prevalence among individuals with different psychiatric disorders. Therefore, we conducted a study to compare the risk of developing sleep disorders in patients with major depressive disorder, bipolar disorder, and schizophrenia.