Before the Death Note, Light was bored and frustrated.

L is an insomniac.

(Spin-off of "ash", diverging at chapter xviii.) Light and Lawliet are dead, but somehow ended up in the Shinigami Realm. Light appears to be trying to trick Shinigami out of their Death Notes, Lawliet appears to be doing nothing to stop him, and none of it is probably true. But some of it might be. (Either way, though, they certainly aren't bored anymore.)

"But this pride... I'll just have to... get rid of it!" In which Light's personality doesn't change when he loses his memories of the Death Note, and he deduces that the only possible solution to the Kira Case is that he's Kira and just doesn't remember it—or that Ryuzaki is Kira and framed him for it.