Objective: To describe the changes in sleep health domains and examine the associations between the repeated measures and intraindividual variability (IIV) of these domains and perceived stress. Participants: A diverse racial and ethnic group of first-year college students (N = 23, 78.3% female, aged 17-18) attending in-person classes during the COVID-19 pandemic. Methods: Sleep health domains were determined using 7-day wrist actigraph and daily sleep diaries, and perceived stress scale was completed at 1-month intervals across 3 months. Results: Sleep timing, regularity, and alertness during daytime demonstrated statistically significant changes between three timepoints. Greater stress was associated with more irregularity (B = 2.25 [0.87-3.62], p < 0.001), more dissatisfaction in sleep (B = 0.04 [0.02-0.19], p < 0.01), alertness during daytime (B = 0.18 [0.05-0.31], p < 0.001), and greater IIV (i.e., fluctuations) in sleep satisfaction (B = 0.083 [0.02, 0.15], p < 0.01). Conclusion: These findings offer insights for future researchers to facilitate intervention development to promote mental and sleep health among college students.