The above screenshot is from the event (via Keith Koffler).
Via White House Dossier:
President Obama appeared exceedingly sleepy at the annual National Prayer Breakfast today, looking like he was having trouble staying awake as others spoke and delivering his own remarks ponderously, with heavy eyelids and a tired visage.
Obama, who rarely holds a publicly announced event before 10:00 am and is known to be a nighthawk, was forced to show up at the breakfast at 7:55 am.
While listening to the warmup speakers, the president’s eyes were frequently downcast, he appeared drawn, and he was chewing gum, presumably the Nicorette he is known to use to satisfy his nicotine addiction without smoking. He occasionally brushed a finger onto an eye, as if trying to remove morning crust or wetness. He sometimes seemed to miss his cues to laugh or smile politely at jokes.