This app is full of up-to-date research evidence about biologically normal sleep for babies. It is project of the Durham University Parent-Infant Sleep Lab, one of only two places in the world that researches this field.
There’s lots of information on; how babies sleep, where babies sleep, sleep health & safety, co-sleeping etc. All of it backed up by research and a proficient understanding of human sleep and anthropology.
If you really want to understand the realities of normal infant sleep without the ignorant and misguided advice that all parents are bombarded with, then this is a must have app!