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 not only affects your quality of life. It can negatively impact your treatment and increase risks for other physical and mental health problems. For example, cancer-related fatigue, daytime sleepiness (hypersomnia), anxiety and depression are commonly reported in people who experience sleep disturbances.