Spouse, age 93, dx'd w/dementia 7/2014 by psychol; other med probls: chf, gout, spinal stenosis, deaf, hbp (controlled). Currently sometimes sleeps OK, but still gets up and while eating a meal, will fall asleep and sometimes will not rouse unless shaken. Can occur in AM, daytime, after evening meal. Loses track of time of day, day of week, etc. What might be causing sleepiness even after a night's sleep?