I figure she has about an hour before whatever she is taken to prop her up begins to bottom out.......at the last debate she kept her eyes often downward for that reason....even when she spoke she often did so with her eye lids lowered....
I don't know what her health issues are.....but I do know it's nothing to toy with and that's what she is doing and those who are circled about her. ..and this by her insistence IMO.