Self-supervised learning of accelerometer data provides new insights for sleep and its association with mortality by Yuan, H, Plekhanova, T, Walmsley, R, Reynolds, AC, Maddison, KJ, Bucan, M, Gehrman, P, Rowlands, A, Ray, DW, Bennett, D, McVeigh, J, Straker, L, Eastwood, P, Kyle, SD, Doherty, A