В чем разница между I always try not to make noise when he sleeps. и I always try not to make noise while he is sleeping. ?Пожалуйста, приведите примеры.

"I always try not to make noise when he sleeps"
1. in general, he sleeps here every day (for instance), and I try not to make noise every day when he is sleeping
2. a bit awkward, but it can focus on the action itself. "sleep" in general is more often thought of as a process than a concrete action, but this form nonetheless emphasizes that. (a better variant, if this is the goal, would be "when he goes to sleep," which sounds natural)

"I always try not to make noise while he is sleeping"
1. focus on the process. Throughout the duration of his sleeping, you try not to make any noise. It would sound a bit better without "always," in my opinion, because there's a logical mixing of "always" and a fixed portion of time