Dreaming of bragging means you are showing off to hide shortcomings and yearning for acceptance. Is there something that you should be focusing your time and energy to improve? Would you need to brag if it was really good and easily noticed by others?
Are you afraid that you won’t be accepted? Continue working on yourself, and let the process become the results.
Hiding shortcomings is temporary, and acceptance comes with familiarity. Focus on improving yourself in whatever areas you choose, and it won’t be necessary to brag in your sleep.