Sleep affects blood sugar spikes

When you don't sleep well, your body produces more of a stress hormone called cortisol.

This hormone makes it harder for your cells to use insulin, which is like a key that helps sugar get into your cells from your blood.

So, when you eat the same breakfast after a bad night's sleep, the sugar stays in your blood longer, causing a bigger spike in your blood sugar levels.

It's like your body is trying to protect itself by keeping extra energy in your bloodstream.

This is why the same meal can affect your sugar levels differently after a night of poor sleep.