How do I make my iMac screen completely black - without sleep or turning it off?

I have somebody sleeping in my office who finds the light from my iMac disturbing, even when it's turned down to the lowest level.
Is there an easy way, just for a few days, to make the screen completely black at night - I don't want it to sleep or to switch it off so I can use it early in the morning remotely.

What you are suggesting, puts the computer to sleep. just what fusbariclation does not want to do. He/she just wants to put the display to sleep.
On my iMac, my Macbook Pro, my Wife's Macbook Air and her Macbook Pro the Control-Shift-Eject just turns off the screen, but the iMac continues to run, which if very important for me, as my iMac is a web server for the rest of my team at work.  I generally hit Control-Shift-Eject as I'm leaving the office every night.
HOWEVER, since the OP (Fustbariclation) wants to access the iMac remotely, and wants the screen to be blacked out during the remote access so it will not disturb the guest in the same room with the iMac, my Control-Shift-Eject does not work for the OP.  I missed that essential tidbit in the original problem description.
Other contributes have come through with working solutions for Fustbariclation

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