It's amazing how almost every baby/kid story you hear you can relate to in some way! I could certainly relate to yours!

Given that your little one only wakes when she is at home, to me, seems like she is just wanting to say howzit to mom and dad in the middle of the night!

We have got two really good sleepers (well, not to begin with!) but through setting out a proper routine and sticking to it vehemently, we figured out what works for us... Our eldest (now almost 3) wakes very occasionally and our little one (17 months) also wakes occasionally. For the eldest - One of us goes into the room, sits on his bed (we moved him from a cot to a proper bed when he was 2) and quietly reassure him that we are "right there for him" and whats wrong - How can I help" kind of thing. We NEVER turn on the light - That equals party time for our little guy! We never spend more that a minute in the room and we are outta there and back to bed... We also leave a bottle on his side table and let him know it's there if he wants it (I can hear you saying "Those people are gonna struggle with wet beds in the future", but we'll cross that bridge when we come to it!)

In the days where it first started happening, one of us would go in, and do the above, then leave the room and latch the door (we never close it) and just sit on the floor outside the room. If he'd call or cry, we'd shhhhhhhh him or whisper "We're right here for you, were not going away". If it was serious hysterics, then we'd go back into the room, but for just as long as it took him to settle. Just them knowing that you are there and all they have to do is you usually reassures them back to sleep.

Our little one usually has just lost his dummy and once located and clipped back on, he's quickly back to sleep.

Hope it helps! Bring on the sleep (and your wife back to bed for that matter)!