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I can't add much in relation to sleep disorders, but I do know that shift work (the dreaded Night Shift) has a considerable amount of research showing the impacts on the body, including the cardiovascular system, and how it can give rise to sleep disorders. Much of the research looks at personnel in the emergency services (police, ambulance paramedics) and associated fields - nursing, for example - and how the impact of sleep deprivation and dependence upon stimulants such as caffeine can reduce the quality of sleep after the shift is over.
It may be going off at a bit of a tangent to your thesis, but the field could also yield some information that may be of use to you.
Just a thought.
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