Everywhere we went, people would sleep on roofs at night. In Varanasi though, we definitely saw the largest clusters of people sleeping together on the roofs:
(PICTURE: Natural AC.)
The only problem with sleeping on a roof is that it exposes you to the elements. You know, like rain or monkeys. Yes, monkeys. In Agra, we saw a family sleeping on a roof. About two minutes after I took this picture...
...a monkey came along and scratched the shirtless boy:
The father wasn't too happy and threw a rock at the monkey: