Previously, Do Not Disturb During Sleep prevented the watch showing alerts from my phone during the sleep period.
A few days ago this changed and I am now receiving alerts on the watch from the phone during the sleep period.
It is annoying being woken by email alerts from the watch, so I can't wear it for sleep monitoring, and it has to be in another room overnight!
This change seems to have coincided with my watch reporting an update to software 14.
I have checked the watch settings via Connect, and the sleep settings all appear unchanged.
My phone uses the same DND settings as the watch.