I've watched these episodes at night and have no problem sleeping.

**Episode 6 spoilers**
I knew there was a connection between Kouta and Lucy (with all those flashbacks to a young Kouta).
I hope that she really didn't kill his sister, but I think that it's being setup that way.
So do you think that Nana goes ballistic and starts killing people?

**End of spoiler**

It just keeps gettting more interesting. I hope that she survives at the end of the series.