On the origins of Jewish customs for "Nittel Nacht", or Christmas Eve. It's not the Chassidishe custom you thought it was. It actually originates somewhere else entirely... Some notes on this episode. Here's a thread I did last year on Twitter. You can see that here. It includes links to a source sheet and some nice pics/scans. https://twitter.com/Adderabbi/status/1342153328709545985?t=jKnOcnxM-N9NSxpmw552Kg&s=19