RecruitingBehavioural interventionCaregiver Stress and Sleep StudyThe purpose of this research study is to better understand how stress, sleep and activity might impact caregivers' mood and brain health. This study includes a randomized experimental component where therapists will systematically deliver one of two evidence-based talk-therapy treatments. The aim is to evaluate effects on meaningful health-relevant measures including morning activation levels, depression symptoms, rumination, and aspects brain connectivity previously linked with depression. Participants will complete surveys about their caregiving experiences, health, and mood, undergo an MRI, and wear an actigraphy watch that measures activity levels throughout the day and when sleeping.