Natural remedies to help child fall/stay asleep?

Im desperate!!! My 4 year old has been giving us such a hard time. I feel like a zombie. He has autism, and the doctor suggested maybe giving him medicine, but im so against it. I wanted to know if there was any natural remedies that can help his anxiety and insomnia. Im about to have a baby any minute now and if things keep going like this, i will literally die from sleep deprivation. It has put a strain on my relationship and also i feel irritated all day and take it out on everyone because im so cranky from lack of sleep. He also skips his naps and just stay laying in bed the whole time. Im sooooo desperate please help!