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Ok, I remember that every single person alive had some sort of pass. Either a day time pass or night time. The day time people had a curfew and so did the night time people. It was because of over population, I believe. It was the system put in place to balance out everything. The two separate populations never saw each other.
I also remember one of the main characters, a female, had a short or deformed hand or arm or arms. The actual main character was a male, I believe.

Samantha, how long ago did you read this book? Was it targeted towards adults or young adults?

Was this more of a fantasy or science fiction or something else?

Fly Trap by Frances Hardinge?

Darkborn?

This reminds me of "Slow Tuesday Night" (available legally here ) which has the population divided into three classes based on the times they are awake, and of Dayworld, which has overpopulation leading to dividing the population by day of the week.

Another possibility is Day by Night

reminded me of the way life was forever by Carey corp but I'm not sure it matches completely

I remember something like this where they shared the same sleeping quarters- the day and the night people, but I can't remember the book. Perhaps we're remembering the same one.

@Shanna: Yikes! I'd be washing the sheets every night!

Possibly Rant

Colleen wrote: "Possibly Rant"

Yes! It is Rant by Chuck Palahniuk. :)