Ways To Tackle Sleepwalking In Children?

Hello there! I am a mother of a 17 year old teenage boy and my son has this odd habit of sleep walking. It was not all that frequent previously but it has emerged out to be a constant phenomena in the last one month . Is my son mentally ill? What could this sleep walking be due to I want to know and also suggest me some effective ways to tackle sleepwalking in children? Thanks!