My mom , 91, is in asst living. I went to visit her yesterday and she was sleeping on her rocker. I talked to her and it took her about 40 minutes to wake up. Tonight I called her on the telephone about 3 times and let the phone rang many times. Phone next to her bed. She did not wake up till a caregiver went to her room on my request. My mom does not have hearing problem nor she is taking new meds. Is this normal not to wake up when somebody talks or phone rings? Or is she becoming comatose?