Why do i feel itchy all over when i'm sleepy or hungry? could being anxious cause itching all over body? thank you very much

Anxiety: Can cause multiple strange unrelated symptoms, itching when hungry or sleepy might be related, both induce parasympathetic / sympathetic stimulation to a certain degree, with the resultant symptom mix, complex physiology and pathophysiology (mechanism of disease). At any rate, you may want to check your thyroid gland status and your blood sugar, just to make sure your metabolic status is fine