CKB and hemorrhagic stroke: A prospective analysis of CKB, including 9,692 stroke-free participants, aged 42–81 years from the European Prospective Investigation into Cancer–Norfolk cohort, included 346 stroke outcomes during 9.5 years of follow-up and suggested that short sleep (≤ 6 h) duration was associated with higher risks of ischemic stroke, but long sleep duration (≥ 9 h) was associated with higher risks of hemorrhagic stroke [14].