When your ring and little fingers feel numb or tingly, or if you notice some decreased or abnormal sensation in your fingers or hands, it may be Cubital Tunnel Syndrome. It may even affect your sleep. Compression of the ulnar nerve at the elbow causes the symptoms. Besides supplying most muscles in hand, the ulnar nerve also sensation to little and half of the ring fingers. Specific points along the path between the neck and the hand may cause stretching or compression of the Ulnar nerve.