Happiness often sneaks in through a door you didn't know you left open. -John Barrymore
Question #894 posted on 10/11/2003 4:02 a.m.

Dear 100 Hour Board,
Why do sometimes when I stand up after sitting down for awhile does my vision breifly black out?
- Greg

A: Dear Greg,

I asked my doctor about that a year or so ago because I experience the same thing sometimes. He said it's due to a decrease in blood flow to your brain due to a drop in blood pressure from standing up. If you experience this frequently, it could be a sign of a serious problem.