The RolE of Prolonged Nightly faSTing to Improve Sleep and cOgnition in bREast Cancer Survivors

Inclusion Criteria: 1. ≥18 years old 2. diagnosed with breast cancer (all stages included) 3. ≥3 months post neoadjuvant or adjuvant chemotherapy (maintenance or palliative systemic therapy is included) 4. score ≤30 or lower on the Patient Reported Outcome Measurement Information System Cognitive Function Short Form 8a (sr-CRCI) 5. able to speak/understand English 6. have access to a computer and Wi-Fi 7. live within the United States 8. Identifies as female 9. willing and able to fully participate in the study Exclusion Criteria: 1. type 1 diabetes 2. actively enrolled in formal diet/weight loss program 3. previous bariatric surgery 4. eating disorder history 5. night shift work 6. pregnant, breast feeding, or trying to get pregnant 7. dementia, psychological, psychiatric, or neurological diagnoses 8. active brain or central nervous system disease 9. prior or current use of memory enhancing medications 10. history or current brain radiation 11. frequently fasting for 12+ hours every night 13\) history of hypoglycemia 14) depression screening on PHQ9 with a score of 20 or greater across all 9 questions OR anything other than 0 on question 9