When does your baby start sleeping through the night (6-8hours)

My son seems to have nightmares, and wakes every 1-2 hours every night. He couldn't be in his own cot since day one. And now he is already 1 yo. Still have nightmares and waking up screaming.

Pls share you experience on sleep training... ppl say they should be sleeping through since 6-9 months...

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