A friend of mine has been having moments of memory loss at random intervals of his life. I am not sure when they started, all I know is that he's 21 right now and sometimes he has lapses in memory, possible blackouts too. They don't last long and they are as frequent as no more than one a month. Usually one every 4-6 months. This last time he has holes in his memory throughout the whole day, no black outs, but he's realizing the holes now that he has had a nose bleed for the past half hour.