So there wouldn’t be any landlords complaining about Lee running over the roofs. At most, one person would maybe send one complaint in the morning: “Some man with thick eyebrows was yelling ‘KUUAAA’ as he ran across our roof at dawn, he was really very noisy.”
And so, under the watchful eyes of the previous Hokage’s faces all carved into the mountain overlooking Konoha, Lee jumped and ran and leaped all across the village.
He kept that up the whole night without a single new idea occurring to him.
And that is how Lee found himself greeting a new day’s dawn without a single wink of sleep.