In 34.19 SleepNeeded can be enabled and in fact the tiredness indicator appears but I wasn't able to pass out my character after 2 days and 16 hours. The character was exhausted, "in danger of passing out", before the end of 2nd day but never actually passed out.
After waiting 64 hours, the character also ate a box of sleeping pills but didn't pass out even at that point.
Maybe something was wrong with my testing conditions or perhaps this doesn't work properly. What do you think?