Wait. Would your parents get mad at you if you got up, and used the restroom? Like really? It doesn't mean you were staying up that late, just that you had to use the restroom.
They'd suspect something from me. When it comes to staying up late I have a history!
If I were you I'd hope your neighbors didn't see you. Lol.
Also, how well would roof shingles soak up piss?
Nah neighbors didn't see, only light was my phone. And I didn't piss on roof shingles, it was more like a semicircle that may have hit my window.
Bahahahaaa Peeing outside during the winter really is wonderful. I've done it a few times, but never out of my window.
Good for you man, though I think it'd be a good idea to wash that window. If the streak gets wet it might start smelling like piss again. 
Great minds think alike :^D