The Lost Boys (1987)

A mother and her two sons move to a small coast town in California. The town is plagued by bikers and some mysterious deaths. The younger boy makes friends with two other boys who claim to be vampire hunters while the older boy is drawn into the gang of bikers by a beautiful girl. The older boy starts sleeping days and staying out all night while the younger boy starts getting into trouble because of his friends' obsession.—Zaphod