I don't know how much it helps, if at all, but I'm a host with two headmates and also have a fully-developed daemon (His Dark Materials type, not separate spiritual entity type). The daemon feels and is very clearly PART of me... and the headmates feel very clearly DIFFERENT from me, but also as close to me as the inside of my own eyelids. They do a lot of talking at me in dreams (they're whispery too. <!-- s

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-->), and their presence lingers after waking. Before I had very good communication with them, I felt very like how you seem to be feeling.
I got in touch with them pretty much by just harassing them into talking. I made up a name for them (Voice, in my case), imagined a fairly humanoid face for them, and pestered them all the time. "Hey, Voice. You there? Yah, you, Voice. I know you're there. You pop up at weird times. Why don't you talk? I know you can; you have before. Answer me, you Voice!"
Eventually I made some headway, just a simple case of, "Hey, Voice, you there?" "Over here."
Didn't take much longer for it to become "Yeah, okay, I'm here. Do you need something? Careful, before long you'll be begging me to shut up."
(He was right, by the way. Frakking noisy. >_<)
aaaand now I have a near-constant internal dialogue, sometimes trilogue or tetralogue, between me, my noisier headmate, the quieter one, and my daemon. Their voices and presences are as distinct to me as the difference in taste of vinegar, chocolate, and miso soup.
I don't know how it will go for you, but I hope you get the communication you want, and that it doesn't become a burden or annoyance for you.
Wishing you all the best,
Asher, Lor, Es, and Ayden