for my case, my parent-in-law let my baby sleep at spring cot only when day light for napping purpose only... we will rock my baby when he trying to sleep while watching astro's babytv and will stop rocking once in the dream...

night time, my baby sleep in spring cot 1st and transfer into bed room with air con and sleep on top on normal mattress, my baby will sleep till the next morning and awake by himself (beside nagging for milk during night sleeping time)