How do I get past this guard?

Hint 1 of 10:

There is an important hint in Willy's notebook.

Hint 2 of 10:

If you don't have the notebook, you can't get through the game.  Call
Dynamix support for a replacement if you own the game, or buy a copy if you
don't.

Hint 3 of 10:

The guard seems to be getting very sleepy.

Hint 4 of 10:

Okay.  He's not tired.  But maybe you can talk him into being tired.

Hint 5 of 10:

Read the notebook again.

Hint 6 of 10:

Do you see anything about hypnosis in the notebook?  Find it.

Hint 7 of 10:

You will have to combine two items in your inventory to hypnotize the
guard.

Hint 8 of 10:

Think about how people are sometimes hypnotized.  They sometimes use
something like a pocket watch or pendulum.

Hint 9 of 10:

You can create your own pendulum.

Hint 10 of 10:

Add the Nintari key to the chain.