What Causes Pregnancy Insomnia?

What Causes Pregnancy Insomnia? What causes pregnancy insomnia? Early pregnancy insomnia is primarily caused by the shift in hormones and the symptoms women experience as a result, such as nausea, vomiting and increased urination. All of this disrupts the body’s regular sleep and wake cycles, Mustaleski says. What causes sleepless nights during pregnancy? Insomnia during