hi mamas, we are currently sleep training our 16 month old son for the first time using CIO extinction. Nights 1 & 2 were surprisingly easy. Night 3, we had a hiccup. While I'm confident that he's going to get this in about a week, i'm more concerned that does this training create more of a sleep debt for the time being? He is been more fussy than usual in the day, but I can't tell if it's something else bothering him (teething, etc). He is getting his normal nap time in, so it's not that. Any other moms notice more fussing in the day during this sleep training process?