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.
There are two types of insomnia based on the regularity and duration of the sleep disturbance and daytime symptoms: 1  Short-term insomnia: This type of brief insomnia lasts for up to three months. 2  Chronic insomnia: This type of insomnia occurs at least three times per week and lasts for at least three months.