Dream about forgetting own birthday expresses a spiritual journey and enlightenment where you will feel rewarded at the end. You may have self-esteem and confidence issues. You may be representing your shadow persona and expressing your subconscious thoughts. It is a metaphor for how you are currently dealing with your feelings and expressing your emotions. Your communication with others is having a toll on you in some way, either directly or indirectly.
Forgetting own birthday dream is a metaphor for your path toward achieving inner peace and finding your spirituality. Things will be much simpler and carefree. You need to look at things from a different view or approach your problems from a new angle in order to successfully move forward. This dream is sometimes the healing process and dealing with losing a loved one. You have a keen sense of smell.
If you dreamt about forgetting own birthday:
You are in a good position to make a major move career-wise, but keep in mind that you will need to be flexible in order to make this happen. This move will not happen exactly as you might envision, but that is fine. You will still come out on top.