I’m 5 months carrying women. In my early stages of pregnancy, I too had the problem of lack of sleep. When I consulted my gynecologist, she recommended performing prenatal yoga as it is the best thing that can help me to sleep well. After I performed prenatal yoga, I started having good sleep at night. Like how I perform prenatal yoga, you can perform normal yoga. Get the help of a yoga instructor. Just go through this link ( https://www.cnn.com/2015/03/26/health/sleep-better-yoga/index.html )
and try bedtime yoga. I’m sure this will have a very good result.