That's an app for taking notes, but it's also handy for typing/communicating with those I interact with on a daily basis (Even though I rarely use the app), and it's good to have if communication is difficult.
As for being up late, yeah, not sure why. 
Usually I'm knocked out by now, but why I'm awake now, I have no idea.
And I'm not sure if Apple has it just yet-- Android yes.
