Most speakers dread the time slot right after lunch, with good reason. The nodding heads and half-mast eyelids are usually blamed on the energy-sapping process of digestion combined with a satisfied state of relaxation. However, published data indicate that 25% of the audience is losing the battle to stay awake for an additional reason; that’s the percentage of people who suffer, at some level, from sleep-disordered breathing. They’re not just experiencing a post-prandial lull. They are being drawn toward full-blown REM sleep — and have been from the time they got out of bed that morning.