It is difficult to definitively determine whether it is coincidence or if there is some underlying connection between your dream and the Amber Alert waking you up. Dreams can be influenced by various factors, including daily experiences, emotions, and subconscious thoughts.
In this situation, it is possible that your dream about your friend being kidnapped and the subsequent Amber Alert are purely coincidental. Dreams often involve a mix of familiar elements from our waking life, and your concern for your friend's safety might have manifested in the dream. On the other hand, Amber Alerts are issued when law enforcement believes a child has been abducted and is in imminent danger, so they are relatively common occurrences.
However, it is also important to note that the human mind is highly complex, and sometimes there may be subtle connections between events that we are not consciously aware of. It is possible that some underlying psychological or emotional factors triggered the dream and heightened your sensitivity to the Amber Alert, leading to you waking up and making the connection.
Ultimately, dreams and coincidences can be intriguing, but they are not necessarily indicative of any mystical or supernatural forces at play. If you find yourself frequently disturbed by dreams or if you are experiencing ongoing anxiety related to your friend's safety, it might be helpful to talk to someone you trust or a mental health professional to explore your feelings and concerns more deeply.