Yes. We've had a few step changes with sleep (DD currently 17 months).
At 7 months we moved her to her own room. She went from waking to feed every two hours in our room to sleeping 11 hours straight in her room the first night. I appreciate this is a rare miracle! From that point she slept through maybe 4 out of 7 nights, and if she was up it was once or rarely twice for a quick feed (BF).
Her daytime behaviour and mood instantly improved with this as she was so much better rested.
At 9 or 10 months she had a nursing strike which we never resolved, and refused a bottle. We had to walk, sing, rock her to sleep (but at least DH could do his share!). Very hard getting her down, often over an hour of exhausted crying in our arms. But once down her overnight sleep was the same as before so it was ok.
Then a few months ago she suddenly started reaching out for the cot when we were pacing the room with her, so started putting her in the cot (screamed if we did this while she was awake before) and shushed, rubbed her back/tummy etc.
A few weeks later DH was doing that and she looked at him and said "bye-bye" (!) so he took the hint and sat in the chair while she went to sleep by herself. Since that point she's been reliably sleeping through, and we've only had to go to her a few times when she's been sick etc in the past couple of months.
Next step is to leave the room when she's awake.