I have the hourly reminders on just to get me to eat some fruit and be mindful - before apple had the sleep app stuff (pre watch 11) I put the phone in DND and everything is fine and I would check Pillow the next day for my sleep stuff - Now I notice if I put my watch into DND and choose Sleep rather than DND the hourly notifications come through..... I do note the apple watch does seem to still see my sleep overnight but this is sleep mode apple why would i want haptic buzzing every hour on my wrist .......