My dd is around 7.5 months old. She's now in her own cot at night and has been for two weeks. She has napped in there since she was 5 months and is familiar with the space.
The last week our baby - who would sleep through the night - is now waking every hour. She was teething but not anymore. She has spent the last two nights in my bed, which she has never done, just so I can function. She came in my bed at 10pm last night after multiple attempts to settle her and she will just scream if put in her cot. Even if she's absolutely sound asleep as soon as she is put in cot she wakes and cries again. This does not happen in the day. She naps well and self settles.
On Tuesday night she slept through the night in her cot, so I know it is possible! She rolled herself onto her stomach and stayed in that position. She rolls confidently both ways.