They do still make noise at night, even when bonded to you. Since they are nocturnal, they jump around and play at night. If you're a light sleeper, they might wake you up running around in their wheels or playing. They also bark. I think their barking is about as loud as a dogs squeaky toy, if you want something to compare it to. Some bark more than others. They make other sounds too, but the barking is the loudest you're likely to hear at night.
I don't think they smell bad - I actually kind of like the smell. They smell kind of sweet. They don't smell as strongly as ferrets do. If you keep their cage clean and feed them a proper diet the smell shouldn't be unmanageable. Also, intact males smell the worse. So either get neutered males, or females if you're really worried about the smell.
They need to eat fresh foods - you can't just leave pellets out for them like you could with some pets. If you're only gone for one night and fed them right before you left, that would probably be okay. But if you're gone for more than one night I wouldn't leave them alone.
I have pretty bad allergies and sugar gliders don't bother me, but everyone is different. Maybe you could find a breeder or someone who owns them in the area and go meet their gliders? You could take your mom with you and see how she does around them with her allergies.
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