I’m assuming it’s an adjustable bed and he increased the incline at the head of the bed and now he is getting too much blood to his feet and causing them to hurt and swell. He is going to have to fold him self up in that bed in order to wake up pain free
Or Anacin, which is also the combination of aspirin and caffeine. Or generic aspirin (500 mg) and 1/3 cup of coffee for each pill.