My kids use to be great sleepers don't no whats happened recently my daughter is waking in the night…

My kids use to be great sleepers don't no whats happened recently my daughter is waking in the night then waking up at the crack of dawn jumping in her cot and shouting witch then wakes my son up😴

Any suggestions what I should do should I move her bedtime later or drop her nap in the day or just shorten it?