Are there any laws in Nevada regarding a non custodial parents having the child sleep in the same bed as him and his girlfriend during his visitation

Short answer "no."  Long answer "sort of" -- it depends on the facts.  There are statutes about abuse, and about neglect -- would you term the child's treatment to be either of those things?  You say nothing about the age of the child, or about any harmful effects suspected or observed.If you are concerned, you should probably first address the matter directly with your ex.  If that proves unsatisfactory, consider initiating mediation, or filing a motion to alter the custody and visitation orders to alleviate your concerns.