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A night hag or similar outsider with mind-affecting abilities might be similarly 'connected' to the patron, which itself might not have a separate existence as a 'creature,' being more of a metaphysical thing, like a cosmic (un)consciousness or something.
While night hags, perversely, don't actually have a bunch of abilities that allows them to communicate with people through their dreams, that's easy enough to fix. There's no reason *this* night hag couldn't have telepathy and / or some sort of dream communication ability. (Or the dream haunting ability be flavored to allow communication, in a harrowing Con-damaging sort of way.)
I picked night hag mainly because hags and witches are already associated, and night hags would be the most likely to have some sort of connection to a mind/dream/nightmare sort of 'patron.' Other sorts of creatures are just as possible, such as a psychopomp or protean. Just because the *average* member of such a creature type doesn't necessarily have any useful dream/mind-communication ability doesn't mean that the GM can't rule that this one has a unique-ish ability to do so, perhaps because of it's own tenuous connection to this 'mind' patron.