wake up disorders

My 61 year old down sindrome brother, sleeps well, wakes up normally around 6 am. We live in the Republic of Panama. During the first hour he is prone to having a black out and has fallen several times, since October 2008 we have been in the emergency room three times and the wound in his forehead always has been stiched. I am terrified that he might fall and have such a serious hit that he could remain unconscious forever. Some times there have been seizures. The rest of the day he is ok. Since late February he has been taking EPAMIN (fenitoina sodica), which has controlled the seizures, but not the blackouts. When he wakes up we make him excercise in bed, raise his head and his legs, his arms. Give him the EPAMIN with pear juice. After 15 minutes we supervise his getting out of bed. Normally he has a mild black out but with supervision he does not fall. All exams (cats, electros, halter, etc.) indicate normal status. Because he is DS he is a difficult patient and needs all the attention and love he can be given. Appreciate help.