Sleep training and waking up at night

Ashlee

I feel like this is sleep training 101, but please help a mama out because apparently I might have missed something 🤦🏻‍♀️. We sleep trained our baby starting at 6 months old because she would sleep through the night, but it would take me about 90 minutes of nursing and rocking to get her to sleep. So we sleep trained to get her to fall asleep on her own. For the past month or so she has started waking up in the middle of the night. I always go in and comfort her when she wakes up because she has been such a good sleeper, so I assume that if she wakes up something is wrong. But now I think she’s playing me 😂. Does sleep training apply to night wakings, too? Do you use the same cry it out or whatever other method for that?