Mostly, the pillow just receives grumbling in response. One of the benefits of his power being vocal is that Sean's body is built to compensate for a voice that could deafen everyone for a good three-mile radius. That is to say, he has the (currently) sub-conscious but still very real gift of selective hearing. So, yes, he could quite literally sleep through an air raid siren unless trained to do otherwise, a fact which had always sent his mother into fits back when he'd habitually failed to respond to his alarm clock on school days.
It does always help to smell food already cooking, however, when one is supposed to be waking up. Therefore, it is an admittedly disheveled and yawning ginger who wanders downstairs a little after Alex, still in a pair of pajama pants that are even a little bit too long for him and a shirt pulled on mostly out of courtesy to the rest of the house. How long after is, by the way, almost exactly five minutes. There are just some lines, after all, that any self-respecting smart ass has to push.
"G' morning." He is comparatively less of a speed-eater but growing up with only half as many spots at the table as there were children trying to fit breakfast in before leaving the house is definitely something that has stuck with him, given the size of the helping he takes on the first go.