There is a new paper out which is partly funded by Oura Health Oy: «Selecting a sleep tracker from EEG-based, iteratively improved, low-cost multisensor, and actigraphy-only devices» https://www.sciencedirect.com/science/article/pii/S235272182300267X The author of the papers have a conflict of interest since it was partly funded by Oura Health Oy: Funding This work was supported by funds from …