Have sims always been able to fall asleep in a chair?

Yes, it has been around since city living.

Sims falling asleep in their chairs is very common and you don't need city living. It occurs when they are very tired or drowsy and are sitting down. Instead of falling over, they just fall asleep in their chair. I htink it can also happen from the dazed moodlet

Oh ok that's so wired I've never seen that happen since I got the game in 2017! But i like it, i hope elders can do that in the rocking chairs

A Sim with the 'Lazy' trait will fall asleep in chairs quite often.

I've seen Patchy fall asleep in a chair. Maybe he was lazy.

Yep, been around since release. I remember playing the asylum challenge right after release and my sim missed out on a getting a bed and I was blown away when she went to a chair and napped. ETA: They also fall asleep during a bath. That bugs me, as I like my sims to take a bath and then they'll fall asleep when I don't want them to.

Zzz...
https://i.imgur.com/iMteKz4.png

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I've had sims sleep in the bath but only toddlers nap in chairs.