What is the difference between these two products?

He broke the cup in anger.

This silkworm has entered the rest period before moulting.

I'm sleepy, so I'll go to bed early.

He continued working, fighting off his sleepiness.

I am very sleepy.

I'm feeling sleepy, so I'm going to bed now.

I heard the sound of the window glass breaking.

His jeans were torn at the knees.

There is a beautiful silk tree planted in the park.