Sleeping Question

Jamie • We have a 12 year old boy, 10 year old girl, 11 month old twin boys and 1 month old twin girls.
I'm 28 weeks pregnant with twins and suffering from restless legs bad. I've cut out caffeine, I've added more iron and have done everything I can think of and I still can't sleep. Tylenol doesn't help and I don't even like taking that. Is there anything else that's safe to take for sleep when it gets really bad?