If you were dreaming of seeing yourself with straight hair, and in reality, you have curly hair, it can mean a change is suggested for you. You may be used to a certain look, or certain way, and this dream suggests a change may be called for.
If you have straight hair in real life, and in your dream you have straight hair, then this probably means you are satisfied with your hair in waking reality, and your inner consciousness does not wish to see a change.
