Leg itching mostly in bed. Why is that?

Many reasons. Most important is to see your doctor! could be simple as bed bugs, or fleas, but could be a vascular condition warning you of diabetes, or peripheral artery disease. If you are a women who is perimenopausal, or on bc pills, these are synthetic hormones and can really create havoc in your reproductive system, one symptom of which is itchy legs or hot feet. Find an exp biodentical specialist.