Should I awaken Mom with dementia when she yells out in her sleep?

My 89 year old mother who was diagnosed with dementia 3 years ago was very agitated in the evening and went to bed angry at me. During the night she began yelling in her sleep. It sounded like she was arguing with someone. It was very loud - it even startled my dogs and they began barking. I did not wake her up because I was afraid she would be disoriented and combative. She stopped after about 5 minutes. Should I wake her if this happens again?