A.E.
It sounds like it's possibly night terrors to me. Both of my kids have had them around that same age. It's like they are awake but they aren't really even if their eyes are open. My kids often acted like they didn't recognize us. It is common, the pediatrician even asked if my daughter was having them yet at her 15 mo. appointment. She has had a few.
My son would scream until we gave him warm milk (bottle/sippy) and then drink it and fall back asleep. My daughter won't take her bottle until she has calmed down--it's hard to know what works. A few times lying next to me on the couch or bed has calmed her and then she will drink her bottle and calmly fall asleep in her crib.
You may want to research night terrors to find out what other methods work. Good luck.
AE