It struck me I should say that I watched Bush in high-definition, and on regular TV, he didn't look so exhausted. But others saw a similar affect:
As you noted, the President's presentation last night was surprisingly disjointed for "a major policy address" - at one point his verbal tone and eye movements prompted my impression that the teleprompter had malfunctioned.
What came to mind was a line I remembered from the late, great Hunter Thompson's classic Fear and Loathing on the Campaign Trail '72. In describing the doomed tone of Ed Muskie as his campaign unraveled, Thompson wrote that Muskie
"talked like a farmer with terminal cancer trying to borrow money on next year's crop."
One can only shudder in anticipation (dread?) of how he will look and sound when he announces the air strikes on Iran.