"I prefer to travel by night, but if you're tired, you can sleep in the saddle." There wasn't a Dothraki alive who couldn't eat, shit, sleep, or do anything they could on the ground on horseback. Daenerys had learned what she could while she could, and she could keep a sleeping man in the saddle with her. "I find it better to avoid those who prey on travelers."

And her dragons could escort them unseen, which was most definitely an asset.