Please forgive me if I seem cynical or judgmental as that is not about to be my intent... I just simply don't believe what you said is possible without a logical "solidified" explanation.

Is it remotely possible that you have had some incredibly traumatic experience early on in your life and are now suffering from dissociative multiple personality disorder? You may be aware of a trauma or abuse that you suffered but you may not be aware of the having multiple personalities that you developed to protect your fragile psyche. If that were the case then your other personalities are capable of doing things without you knowing it. Such as texting you from another number somewhere or paying someone to do it and you wouldn't even know it.

I heard that this is an extremely rare condition. It just seems more plausible than a complete stranger tapping into your dreams, seeing your phone number, and texting you with explicit details of your private untold dream. If this is the case then it begs the question why is your other personality trying to communicate with you. Maybe the dream is really a bad memory that needs to be dealt with. Maybe you should see a therapist.