Hello dear, I understand your concern. In my opinion the vomitings might persist upto 5 months in a few pregnant woman. Take doxinate. It is safe and it is the first line of drug in treating vomitings during pregnancy. Its good that the vomitings are controlled by medicines. There is nothing specific regarding vomiting at midnight. But avoid spicy and oily diet . Take bland diet at night. The vomiting can also be due to gastritis. So if there is heartburn antacids also might be helpful. Take adequate fluids upto 3 litres per day,coconut water to prevent dehydration caused due to vomitings. Nothing to worry as such. They will subside spontaneously around 5 months mostly. Hope this helps. Best regards....Dr.Srilatha