Hi Nilly,
Thanks for your response to my question - I was in your same shoes a week ago, and looking for suggestions. I tried experimenting with different A times and it didn't help my 5 month old. It doesn't sound like it's working for you either! I don't know if this will work in your case, but I thought I would share what worked for us. I went back to the awake times that were working when this 45 minute nap stuff started happening, which was 2 hours. And then I started organizing her awake periods differently to start out with the most stimulating activities, and worked down to the most calming ones. I also limited how much time was spent in potentially overstimulating activities to make sure she was mellowed out enought to fall asleep easily and stay asleep through that transition to the next sleep cycle at 45 minutes. Well, it worked the first time I did that, and for every single nap since. Now her first 2 naps are consistently 1:30, and her catnap is 45 minutes.
I also changed her wind-down to include about 20 minutes of walking around the house doing stuff, while I talk or sing to her, (as many others have posted that this works) and then I just put her in her blanket sleeper, say my sweet nothings, and she puts herself to sleep. So the wind-down ritual is somewhat longer, but much simpler than it used to be. (Mine is an angel baby too).
Anyway, I don't know if this will help, but I wanted to share just in case it might. Keep us posted on how things go, and I'm sure you'll get other suggestions...
kate's mom