Believe it or not! I test my blood sugar about 8 or 9 times a day (Type I diabetic, the old "Juvenile Onset" type - and if I wake up unsure of why I've awoken, I'll often test it then. The monitor has a light for the results, but you still have to see where to stick yourself, where to place the blood drop, etc. - all without waking anyone up - or yourself too much, for that matter. The GBA SP, then the DS was what i used to accomplish the task.
Modern Medical Science at work!