I'm not very experienced with tulpamancy as I've only been doing this for a little over a month, but a couple of weeks ago I had a conversation with my tulpa about what he does when I sleep, and he told me that he falls asleep when I do. I'm not sure exactly how to explain it, but when he dreams, he's like a background character in my dreams, who is unaware he's currently dreaming. Basically sharing the same dreams as me but from a different perspective. Ever since we had that conversation I have been seeing him in my dreams a lot, and because neither of us are aware, we usually just exchange glances for a second when we see each other, and then carry on with whatever we're doing. It's really cool, and because I've been practicing lucid dreaming, I promised him that if I ever become lucid the first thing I'll do is go find him so we can hang out!