If this 6 year old boy is truly a Water child, the constitutional
ke triad is Water - Fire -Earth. Sensitivity to textures in the mouth corresponds to Fire and the Heart - a form of hypersensitivity in contrast to the hyposensitivity of his large muscles and joints. Picky eating is a very common characteristic of Water children, and, in my view, not an abnormality, except, in this case, as it relates to oral hypersensitivity.
Water children tend to have less body awareness than other children as well as less clock time awareness, since their inner life tends to dominate their consciousness. But, he could also be a Fire child with a weakness in the Water aspect of the Fire Triad: Fire-Metal-Water. Also, developmentally, he may be “stuck” in the Water stage and not fully progressed into the Wood and Fire stages - where does he stand developmentally? Are his teeth developing normally? Height and weight? Hair, muscle development, balance? You say he’s awkward, Water children do tend to be less coordinated at an early age than other types. Water children like to do things at their own pace, their own rhythm, one thing at a time. Overwhelming them with too much information or too many jobs at once causes them to “dig in their heels” and push back or retreat. Talking back can also be a way of voicing his own point of view rather than attacking that of his parents or teachers. Boys like this do well by engaging in physical disciplines like yoga, judo, aikido, ping pong, surfing, anything that get them into their physical bodies.
Getting overheated at night is a sing of Fire-Water, Yin-Yang, imbalance. Water Seeker is a good formula to consider for this boy at this time. Yin nourishing foods are also important: juicy fruits and vegetables, good fats and oils, pork and lightly cooked eggs.