I was going to agree with your thoughts that it might be a growth spurt. I know that my DS still does that and he's almost a year--but he'll go through spurts where he takes crazy long naps, wants to eat all the time--just stuff that is different than his normal routine (and he's been a fairly consistant child). But it always sorts itself out in about a week, so I just figure its a growth spurt.
Let us know how you are doing.
~Kim