Alejandro, Romain, Gil are the main contributors to this study that demonstrates how dynamically and highly noradrenaline levels rise during non-REM sleep, whereas they decline in REM sleep:
https://www.cell.com/current-biology/fulltext/S0960-9822(21)01281-1
See the video here: https://www.cell.com/cms/10.1016/j.cub.2021.09.041/attachment/ab9ec3b8-a3f1-470e-8a9c-a2d6ebebc742/mmc3.mp4
