As a symptom of RH, though no doubt of other blood glucose disorders,sleep is actually so important on the effects of blood readings. Also how you feel the next day.
When I get one of my weird, wonderful, vivid full Technicolor dreams.
I am usually knackered the next day and my bloods are usually at least a mmols higher than normal.
There is a study that I have read, (sorry, no link!) That the deeper you sleep, think third or fourth stage of your sleeping pattern, the better you feel and the better your bloods are the next day.
The more you have sleep deprivation, the worse you are. I know, I've been through it all.