I am also experiencing similar pain. I am 19 weeks pregnant and my belly button and the area right around my belly button hurt from time to time. It is sometimes constant but other days doesn't hurt much at all. I have been experiencing this for a couple weeks now.
The immune system is intricately connected to the hormonal system and the brain via messenger molecules, so that emotional stress and factors like insomnia have a great influence on its ability to function properly.
Insomnia Causes and Risk Factors. Insomnia can have a significant impact on everyday life. Whether you have trouble falling asleep or staying asleep, it can affect your overall health. Relationships and work productivity can also suffer. If you have insomnia, your doctor can help you find out what kind you have.