I remember both mine started doing something very similar at that age, just they weren't conciderate enough to do it early like yours, but more wanting to eat through the whole evening with a few catnaps inbeteen.
Your nights are great, so if I were you I'd keep with this pattern for now if you can stand it. It will probably go away by 12 weeks or so, and it does do great things fo.r establishing your long term supply.