Sleep spell

Even from this height, I should've heard the noise of the city—millions of people bustling around, thousands of cars and machines—the hum of a huge metropolis. You don't think about it when you live in New York, but it's always there. Even in the dead of night, New York is never silent. But it was now.

In the streets below, traffic had stopped. Pedestrians were lying on the sidewalks, or curled up in doorways. There was no sign of violence, no wrecks, nothing like that. It was as if all the people in New York had simply decided to stop whatever they were doing and pass out.

Pollux crouched next to a sleeping policeman. "I don't get it. Why didn't we fall asleep too? Why just the mortals?"
"This is a huge spell," Silena Beauregard said. "The bigger the spell, the easier it is to resist. If you want to sleep millions of mortals, you've got to cast a very thin layer of magic. Sleeping demigods is much harder."

"What's happening with the mortals outside Manhattan?" I said. "Is the whole state asleep?"
Annabeth frowned. "I don't think so, but it's strange. As far as I can tell from these pictures, Manhattan is totally asleep.

For a moment it sounded brave, but it died quickly in the silence of ten million sleeping New Yorkers.

Annabeth and I would've had our pick of cars, but they were all wedged in bumper-to-bumper traffic. None of the engines were running

TLO chapter 9-10