Source: Pasman, J., Smit, D., Kingma, L., Vink, J., Treur, J., & Verweij, K. (2020, July 02). Causal relationships between substance use and insomnia. Retrieved from https://www.sciencedirect.com/science/article/pii/S0376871620303161 Highlights •Insomnia and substance use have been linked, but the...