The Family Caregiver Transdiagnostic Intervention for Sleep and Circadian Dysfunction (Caregiver TranS-C) is a tailored intervention that integrates cognitive behavioral therapy, mindfulness, and caregiving guidance. A 12-week intervention, consisting of 4 bi-weekly in-person sessions and 2 bi-weekly follow-up calls phone calls, Caregiver TranS-C includes four cross-cutting modules: case formulation, sleep and circadian education, behavior change and motivation, and goal setting. The modules are tailored to each participants' baseline sleep assessment.

Participants randomized to the Enhanced Usual Care (EUC) control group will receive no intervention during the 14-week study period. Upon completion of the study, participants in the EUC group will receive their sleep report along with sleep health recommendations, the intervention workbook, and a list of caregiving resources.

Tailored intervention that integrates cognitive behavioral therapy, mindfulness, and caregiving guidance.

Sleep regularity will be measured with two nonparametric circadian parameters - interdaily stability and intradaily variability - derived from a 7-day, wrist-worn actigraph. Higher interdaily stability paired with lower intradaily variability at 14 weeks compared to baseline indicates more regular sleep.

Sleep timing will be measured using the 7-day average of midpoint sleep between bedtime and waketime, as derived from a 7-day, wrist-worn actigraph. The midpoint of sleep is the clock time marking the halfway point between sleep onset and offset and is used as a measure of circadian rhythm where a later midpoint may indicate circadian dysrhythmia. An earlier midpoint clock time at 14 weeks compared to baseline indicates improvement in circadian rhythm.

Sleep efficiency, derived as an average from a 7-day, wrist-worn actigraph, will be calculated as the ratio of total sleep time to the total time spent in bed (total sleep time/time in bed x 100%). Higher sleep efficiency percentage at 14 weeks compared to baseline indicates improved sleep efficiency.

Sleep duration, a 7-day average of total sleep time in minutes, calculated as the total time slept (time in bed minus sleep onset latency and wake after sleep onset), as measured by a 7-day, wrist-worn actigraph. Higher sleep duration minutes at 14 weeks compared to baseline indicates improved sleep duration.

Sleep satisfaction will be measured using the 8-item Patient-Reported Outcomes Measurement Information System (PROMIS) Sleep Disturbance Scale, a self-reported measure to assess sleep disturbance severity. Each item is scored on a 5-point Likert scale from 1 (Not at all) to 5 (Very much). Total raw scores range from 8-40 with higher scores indicating greater sleep disturbance symptoms. A lower raw score at 14 weeks compared to baseline indicates improved sleep satisfaction.

Perceived stress as measured by the 10-item Perceived Stress Scale (PSS), a self-report questionnaire which measures perceptions of recent stress. Each item is scored on a 5-point Likert scale from 0 (Never) to 4 (Very often). Total raw scores range from 0-40 with higher scores indicating higher levels of psychological stress. A lower raw score at 14 weeks compared to baseline indicates improved perceived psychological stress.