Some of the effects may not be casual, but there is substantial evidence for many of the cognitive effects in sleep deprivation studies, which just introduce a

Some of the effects may not be casual, but there is substantial evidence for many of the cognitive effects in sleep deprivation studies, which just introduce a lack of sleep. There is probably good evidence for the other effects as well, although I’m not immediately familiar with it. While other issues may be also playing a role or even be the primary cause, the physiological effects of sleep deprivation are likely to make almost any underlying cause worse.