Pretty much, yes. Our wind down is always short, he gets squirmy and wants to go to bed. "A" time is approx. 2 hours, and then we have a diaper change, lullaby, cuddle, and into the crib with his blankie and paci. We did have company last weekend, which I know can disrupt sleep, but the change back to the short nap didn't start until after they left.
He goes down like a little dream, but at that 45-min point, if you don't go in and help him re-settle, he gets all worked up and is awake and grumpy.