Only my girls sleep at night between 1-2 hours? And they wake up sever…

Only my girls sleep at night between 1-2 hours? And they wake up several times barely able to fall asleep. I try not to put them to sleep in the evening if they sleep at 11-12, then after an hour they wake up and refuse to sleep. I can't control their schedule anymore. Now I give magnesium, hoping that they will sleep well. But they wake up in the morning at 11-11:30. It seems like we need to change the schedule, but I don't know ??‍♀️ Share your experience please ?