Use of “only six” seems a bit wordy. “Your imagination” could be switched to “his imagination.” How did he know it needed to be stopped? What made him think it was bad? “And that’s exactly what he did” seems out of place. This could be inferred from the following sentences. “Went to rest” seems weird. “Took a nap or went to bed.” May be exchanged.
I am assuming this is a short writing prompt, so I won’t go into other things that could be added if this were supposed to be a full piece, as it seems to be something that is to be succinct.