其一《asynchorony of mother-infant hypothalamic-pituitary-adrenal axis activity following extinction of infant crying responses induced during the transition to sleep》是一篇发表于2012年的文章，文章里记录了一次测试，测试的内容是在对婴儿进行睡眠训练时，婴儿与母亲的皮质醇浓度的变化。
“considered more broadly, this asynchrony in habituation of behavioral and physiological synchrony is not static or traitlike. that is, as novel and unfamiliar experiences are introduced into children's lives there may be periods or episodes of asynchrony punctuated by longer periods of synchrony. perhaps the developmentally significant aspect of physiological synchrony will be revealed in the patterns of its continuity and change. clearly, research focused on the developmental trajectory of physiological synchrony across early childhood would be a worthwhile next step”.
room share—keep baby's sleep area in the same room where you sleep for the first 6 months or, ideally, for the first year. place your baby's crib, bassinet, portable crib, or play yard in your bedroom, close to your bed. the aap recommends room sharing because it can decrease the risk of sids by as much as 50% and is much safer than bed sharing. in addition, room sharing will make it easier for you to feed, comfort, and watch your baby.