Studies that reported sex hormones, SHBG or hyperandrogenism with sleep problems included total [29, 30, 31, 33, 35, 37, 45, 46, 47, 48, 53, 54, 55, 56, 58, 59], free [30, 31, 45, 46, 47, 51, 52, 53, 55, 58, 59], and bioavailable testosterone [50, 59], DHEAS [29, 47, 51, 55, 59], SHBG [29, 33, 47, 51, 55, 59], androstenedione [29, 48, 54, 55, 59], oestradiol [29, 54, 56], hirsutism [51, 53] and FAI [29, 33, 55]. Here, SHBG is linked to hyperandrogenism.