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Just my husband uses the iMac too. He knows how to get into his account
If it makes it easier on both of you, turn on Fast User Switching. You'll both remain logged in and then it's just a matter of switching users from the menubar or control center. No more having to log a person out and another in and vice-versa.

PS. Not an iMac specific thing, but I've left all my Macs on 24/7 and PCs before that since the early 90s. I don't like waiting for stuff to boot up.

And for some other specific reasons with one particular Mac, I don't even have screens turn off. It stays on screensaver when I'm not using that Mac.
 
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