bed wetting in child

Dear doctor(s)
My son aged 8 is having the problem of bed wetting. He often urinates in sleep during midnight to morning. But sometimes immediately after going to bed also. Apart from this, he has the habit of bruxism (grinding of teeth during sleep). His height and weight are above average for his age. He can not tolerate much cold. Likes sweets more. During the sleep he moves much, throwing his hands and feet here and there. When he is about to pass the urine, he moves much and often turns himself down. He gets deep sleep early in the morning after say 4am or so and it is always a problem to wake him up for school. I would be thankful to you if you could suggest a good remidy. Further symptoms of his body his skin is dry. He palms and feet sweats but they suffer from dry skin also. His feet gets cracked almost throughout the year and some times the cracks are painful also. His palms are also like that though to a lesser extent. They are extremely dry and at present we are managing with some creams suggested by dermatologist. I would be thankful if any of you can suggest a good remidy.