you don't need to do anything but set the intent. you already wake up very briefly after every dream to check you are ok and everything, you just don't remember because you went back to sleep so quickly and never fully woke up. If you know you need to get up early to do something or you are anxious about something, then sometimes if it is strong enough your awareness will take over and you will wake yourself up. you need to set an intent to regain awareness and WILD when this happens.