My son is 48 yrs old. Lives alone. Has lots of health problems. He is a high functioning autism person. He has Bi Polar disorder, Anxiety disorder, and mild diabetes. We have established that the problem is not related to diabetes or blood sugar. He has spells where he has to suddenly go to sleep or go lie down. He can hear you if you talk to him, but he can t converse intelligently. What kinds of things cause crashes like this.