24 wks prego and I have a very active 20 month old

My husband works 12hr shifts so most of the time is just me and my little man. He's so much fun but always jumping on me and climbing all over me. Woo he's defiantly a workout and I don't get much sleep with him so I'm always tired, any advice out there? I know it just going to get crazier when baby girl gets here, but I'm really hoping he wants to be helpful and not jealous. Suggestions welcome!! :-)