Help me please

Maegen • Mother of a girl(5) and a boy(4) and boy(1y) and girl due March 20’

So I currently have 50/50 with my kids father. I am trying I get more time cause hey just don’t have a stable schedule anywhere and I don’t work and am currently 32 weeks pregnant with their brother. Anyways I am having the worst time getting them to go to sleep and stay asleep in their own beds. Any advice? I’m losing my mind and I’ve gotta get them to sleep in their own beds before baby brother gets here or I’ll never get any sleep. They are 4(girl) and 3(boy).