Agreed. Naps are great, but please don't allow yourself to be sleep deprived while pregnant, which is inevitable if you plan on switching to a polyphasic schedule with little to no core.
"Pregnant women particularly need sufficient sleep to nourish the development of their infants and the energy they need for the labor and delivery process. Sleep deprivation during pregnancy has been associated with longer labor, elevated perception of pain and discomfort during labor, higher cesarean rates, preterm labor, and higher levels of pro-inflammatory serum cytokines. Limited research has also indicated a possible relationship between sleep deprivation and preterm births and postpartum depressive mood…Many women are not allowing themselves enough sleep partially due to lack of knowledge of its adverse effect on their health. Much remains to be learned about the extent of sleep deprivation during pregnancy and its effect on maternal and fetal outcomes."
Sleep deprivation during pregnancy and maternal and fetal outcomes: Is there a relationship?