Objective To investigate the effect of acupuncture at Baihui acupoint combined with acupoint selection along the meridians(the same meridian,the related meridians,and non-meridians)on the level of melatonin(MT)in rats with insomnia and the effect of acupoint selection along the meridians on acupoint compatibility.Methods A total of 60 male Sprague-Dawley rats were randomly divided into blank group,model group,same meridian group(Baihui and Shenmen),related meridian group(Baihui and Sanyinjiao),and non-meridian/acupoint group(Baihui and non-meridians/acupoints),with 12 rats in each group.A mode...