Sleep talking can occur because of certain medications, emotional stress, mental health disorder, substance abuse or Sleep Disorder. Occurrence of sleep talking, reaction i.e. shouting or fear or any violent actions and duration is important in determining whether its just sleep talking or a sleep disorder. Consult and seek help of a professional online or clinic. You could consult me online.

Sleep talking is normal and won't cause any harm. But if it is associated with depression or anxiety it might be severe and it needs to be treated