Weighted blanket for toddler

So, I was curious if the weighted blankets work good for toddlers/kids? My son is 3, almost 4 and he has trouble sleeping at night. He loves his room and he is obsessed with his car bed but he has alot of troubles falling asleep/ staying asleep. I, myself have trouble with sleeping and have to take medications to sleep so it could be genetics but I really dont want to give him medications! I want to try every option before a medication. Ive heard that weighted blankets work really good but I dont want to spend 40$+ on one and it not actually work.