be afraid of ~ing , be afraid to Verb

The boy was afraid to wake up his nasty grandfather

The boy was afraid of waking up his nasty grandfather

Is there any difference
in meaning?

if not, why do the people use twe sentence?

Here's one about "to like to do vs to like doing":  [post]101212[post]

Why doesn't my link work? 

Possible contexts:

1. "Wake up your grandfather and tell him dinner's ready", said his mother. But the boy was afraid to wake up his grandfather. Whenever he woke him up, his grandfather hit him with his walking stick.

2. The boy sat quietly in the corner. He wanted to play with his toy soldiers; but he was afraid of waking up his grandfather.

In #1, the "waking up" would be a deliberate action. In #2, it would be the inadvertent result of another action.

MrP

Thanks for your answer.

I expect your answer ^^

and your answer is interesting.

Thank you ~