You, that is, spirit leaves the body every night while you sleep. It is not a big feat, it is normal for everyone. If people stop sleeping for 5 days they become mentally disturbed, mostly becasue the soul didn't get the chance to leave the body. the most important time of night when we leave our body is the two hourse before midnight when deep sleep occurs and the detachment from the body is complete. The soul travels to lots of places and star systems/dimensions during that time, but most people don't remember when they return to waking state, except perhaps through some dreams. The spirit also exits the body when subdued phsycial functions make it difficult for it to remain the body, during trauma, accidents, and of course, death.
Yes, childhood fears or traumas tend to manifest as physcial sensations or dysfunctions, unless cleared from the cellular memories, as can be done through such methods as Sacred Santemony (see my website).
You can access information about your puspose here from beings on the "other side" who are not limited by a physical body and can see clearly what a person's soul information is, both past and present. My wife Lillian can have these wonderful beings, who once lived on earth such as the biblical Abraham, Isaac, Benjamin, or others speak directly with you, through her vocal cords. Such as session leaves you with a clear picture about what you are here to experience and do. You can contact her at email@example.com.