I won’t say much, but I finished Harry Potter earlier this morning (3:15 a.m.). Once again, I couldn’t put it down past a certain point, though I couldn’t say exactly where that point was during my reading.
Distantly potential spoilers, but probably not:
All I will say is that my previous suspicions that the entire series is a chiasm, hinged on the final events of book 4, were correct. Books 3 and 5, 2 and 6, and 1 and 7 are parallel to each other in events, character events, actions taken, themes, etc.
For those still reading the books, enjoy! There’s a great story ahead straight through to the end.