We moved Little V out of the co-sleeper and into her cradle after her first 10 days or so, and she’s done well. The best is when she passes out while eating, and we effortlessly transfer her into her cradle for the night. Otherwise, she does fuss a little if she’s awake when we put her to bed. We swaddle her with a Velcro swaddle, and she’ll usually do some coos, grunts, and thump-kicking for 5-15 minutes before giving into sleep. During this time, we find a little ocean wave background noise and rocking the cradle to be helpful.
Rather than get out of bed and stand there rocking in the dark, I tied a long strap of leftover tulle from our wedding to the cradle to enable rocking while lying down. I was quite impressed with my own creativity, but this might earn me some kind of laziness award.