I didn't reduce night feed amounts until DD was sleeping through until 4 or 5am consistently. I never did a DF with her and she had her last bottle at 645pm... so she was going a long time already between feeds
She was 4.5 months when I night weaned her...
I survived the 45 min nap monster too... it was rough! I just did my best to keep her feeds close to 4 hrs apart... if it was going to be time to eat during a nap, I would move the feed to just before her nap to avoid a wake caused by hunger - on the hope that she was actually gonna sleep longer than 45 mins
She rarely did, but at least I knew should would have a good nap with a full tummy.