if you were here where I live my treatment providers call this normal levels of concentration/self hypnosis and normal levels of dissociation that every human being has. its also called out of body experience among those that believe in the paranormal here in NY. its also a therapeutic technique used in meditaiton/relaxation\visualizations to purposely slip into a daydream state of mind while zoning out, relaxing/staring at object (candles/walls\photos\doors...what ever works)

i cant tell you what this is in you, only your treatment providers can do that, my suggestion is if this continues to bother you contact a mental health treatment provider, they will be able to tell you what this is with in you.