Why Is YouTube Always Down During The Night?

Why the hell is YouTube always down during the night?
YouTube probably get it's most hits during the night, when people get nostalgic and are somewhat drunk you tend to see what you can find on YouTube.
Just like now I wanted to look up Micro Machines commercials.
Damn you YouTube, what the hell can you guys be doing if you have to pull down the site every night!

Nice logo I'm created with every night I try to access YouTube.