One of the reasons we can wake up during the night or early morning in particular, and struggle to get back to sleep, is because of a blood sugar drop i.e. we actually get hungry. When our blood sugar drops, the body will release adrenaline which helps mobilise stored glucose from the liver, called glycogen.

Of course, that adrenaline is not very helpful to our sleep. We then feel "wired but tired".

The currently popular low carb and intermittent fasting movements can both contribute to this issue…..