Girls, help! Someone has any advice? A baby is 6 months old and starte…

Girls, help! Someone has any advice? A baby is 6 months old and started sleeping badly at night. Earlier they fell asleep at 8 pm and woke up around 7:30. Now lately, they wake up at 3 am and can't put them down for two hours. There are two daytime naps of 2 hours each, is there anyone who knows how to fix the child's sleep? And earlier, they woke up for feeding 1-2 times, now they just cry for a bottle ?