I worked shifts for over 30 years up until 2013 , when I retired , since then my sleep pattern has been erratic to say the least , did see someone about it but was told my body clock is all over the place due to my shift work , I don’t find my blood sugars affected that much just energy levels can be affected . As far as DP is concerned I only notice it when I wake up whatever time it is , which is probably the way DP works , a sort of liver dump to give u more energy to start the day , not sure if that’s a true statement but it helps me understand it , what time it happens for certain I’m not sure cos I’m asleep ,but I know my sugar does tend to rise from normal levels when I wake up ,