<Tr> <Th> Lower limit </Th> <Th> Upper limit </Th> <Th> Unit </Th> </Tr> <Tr> <Td> 28 or 30 </Td> <Td> 280 or 490 </Td> <Td> nmol / 24h </Td> </Tr> <Tr> <Td> 10 or 11 </Td> <Td> 100 or 176 </Td> <Td> μg / 24 h </Td> </Tr> <Ul> <Li> Cushing's syndrome or hypercortisolism: Excessive levels of cortisol in the blood </Li> <Li> Hypocortisolism: Insufficient levels of cortisol in the blood </Li> </Ul>

An increase in total sleep time causes an increase in the level of stress hormones