I’ve just got my baby to sleep using the Ferber method on the first try (hooray!). My question is... if he wakes up in say 20 mins, do I start again? Or assume that’s all the sleep he wanted? His sleep cycles can be anywhere from 30-45 mins. Do I need to go back in and use the method again to help him link to the next cycle? Does it depend on whether he seems content to wake up or is crying?