I have 2 cats - both females - littermates - 2 1/2 years old. They are WONDERFUL - a great addition to our family. However, one of them has been waking me CONSTANTLY for the past 3 nights. She is fed, has water, is not sick. She scratches the blanket and then 'taps' my face and makes her 'happy noise' - I have no idea what she wants/ needs - nothing has changed in our home or in her diet, etc. HELP!! I'm tired!!