Do the ducks sleep in a coop area, or on the dam, or in the yard somewhere?
The dogs may well be disturbing them at night, even if they're not afraid of dogs, because sudden blasts of sound often trigger in birds the desire to vocally connect with their family group.
Having said that, wild ducks are sometimes noisy at night but quiet during the day.
If they don't feel secure they might be noisy at night, but conversely it may be because they feel too secure, and have lost that instinct to hide their presence during resting hours. Many roosters are like that, because people don't cull it out. I've been culling roosters who crow at night for years now, it's easy to cull that trait out, since it breeds on if you let it, and then you have a quiet coop at night but many people breed the idiot roo who screams all night every night, disturbing all animals and humans within kilometers of his roosting place. Aggravating.
I don't have ducks but have had geese and some were possessed by the need to scream all night every night. Some just weren't. Some felt the need to go for midnight flights into barbed wire fences, clotheslines, trees, brick walls, etc, necessitating their being locked up every night, which quietened them. Perhaps your ducks are just like some roosters and some geese, and feel the need to make a ruckus at night. You may be able to silence them if you change their sleeping arrangements.
Best wishes with gaining a good night's sleep, if that's your issue, I've only just begun to catch up on what my landlord's roosters have been depriving me of for weeks now.