My Late-Night Read

I stayed up until 2 am this morning to finish a book. Why on earth did I do that? Well, obviously, because it was a really good book. Very addictive, fast-paced sci-fi novel for young adults about a dystopic society that pits kids against each other in a fight to the death on live TV.
Weird, chilling, hauntingly creepy, yet strangely I couldn't get enough of it. I started reading it Saturday night once the kids were in bed, and then picked it up again last night. I thought I could read a few chapters and then go to bed but I got to the "point of no return" in the book--I'm not sure if anyone else has this quirk but there's a point in books where I get so close to the end that I figure, why stop now? It could be 40, 50, or even 75 pages from the end. I think it's the mark of a quality piece that the author can keep a reader hanging on like that.
Here's where I got frustrated....At 2 am this morning I get to the last page of the book and there are mountains of questions I have about the characters. What do I see there? "End of Book 1" I had no idea I was picking up a series book when I started. I feel deceived and cheated out of a good night's sleep. I guess maybe it's because I would have entered the book with a little bit more preparedness--thinking to myself, there's going to be questions that the author needs more time to get to. Things will get resolved by the end of the series. But instead I was just left hanging, so to speak.
So I go to the author's website to check when the next book will be coming out--not a word. Not even a mention that this book (called "The Hunger Games" by the way) is the first in a series. A trilogy? A 7-volume encyclopedic work similar to Harry Potter? There's no way to know and that's frustrating the heck out of me right now.
But you can be sure that this novel caught me in, hook, line, and sinker and I'll be at the top of the library's waiting list as soon as the next novel comes out!
On a side note, a few years ago when I read "Twilight" for the first time I didn't know it was a series. I liked the story so much that I actually started back at the beginning and read it again before returning it to my friend. That was a first for me. When I handed the book back to her she said, "Are you ready for the sequel?" I was so excited to get to spend more time with these characters and their story that I nearly squealed like a little girl. That was a week before the third book came out. So I got to enjoy a lot of the story with little wait time.
It's a whole different ball game starting at the beginning of a series and having to wait for the author to actually cook up the next book from scratch--with no hint as to when to expect the finished product.
I wonder if this is more of a testament to our instantaneously-satisfied society and need for information NOW than it is a commentary on why I'm frustrated for liking a book and staying up too late to read it.
Off for another cup of coffee to mull this over.