NR3C2 and sleep disorder: Expression of MR and GR were different between mothers with and without sleep disorder, so placentas were divided into four groups according to the mother’s sleep characteristics: (1) sleep disorder extend from the third trimester of pregnancy to postpartum (Group 1), (2) sleep disorder in the third trimester only (Group 2), (3) postpartum sleep disorder (Group 3), and (4) no sleep disorder (Group 4).