88 year old with dementia started having body spasms, she is sitting in a chair with sides and starts yelling i'm falling. lasts under 30 seconds time?

Dementia: You're describing part of dementia process whereby the body misinterprets sensations. Some people w/dementia are constantly eating b/c they can't remember that they just ate. Others refuse to eat b/c they feel full all the time. While you can't argue or use logic, you can try to reassure or distract. Ask pt's Family Doc or Geriatrician to evaluate for other/correctable causes of hallucinations.