STAGES (n=30,000)
https://academic.oup.com/sleep/article/41/suppl_1/A124/4988361
Others somewhat smaller
https://sleepdata.org/datasets/hchs (N=16,000; actigraphy but not genomics)
https://sleepdata.org/datasets/mesa (N=6,800; actigraphy but not genomics; strength is longitudinal following)