Investigating the relationships between unfavourable habitual sleep and metabolomic traits: evidence from multicohort multivariable regression and Mendelian randomization analyses by Bos, MM, Goulding, NJ, Lee, MA, Hofman, A, Bot, M, Pool, R, Vijfhuizen, LS, Zhang, X, Li, C, Mustafa, R, Neville, M, Li-Gao, R, Trompet, S, Beekman, M, Biermasz, NR, Boomsma, DI, de Boer, I, Christodoulides, C, Dehghan, A, Willems van Dijk, K, Ford, I, Ghanbari, M, Heijmans, BT, Ikram, MA, Jukema, JW, Mook-Kanamori, DO, Karpe, F