Everyone has those days where you have zero energy and you just don't want to do anything. But why does that happen?

There are some obvious culprits: going to bed late, sleeping badly, and skipping breakfast.

But sometimes, you get a solid 8 hours of good sleep, eat a great breakfast, and you still feel low-energy and out of it all day.

It happens a lot when the seasons change, because your body's a little more sensitve.

How do I know if I'll have a "KO" day? If you slept badly, didn't eat breakfast, feel nervous about a test, are a little stuffed up, and it's Monday...you've ticked all the boxes for a KO (knocked-out) day.

How do I know if I'll have an "OK" day? If you literally jump out of bed in the morning, it's a pretty sure sign your day will be OK.

To avoid KO days, remember that your body needs 8 hours of sleep consistently. Also, a good breakfast always helps. Try combining carbohydrates (like cereal or bread), vitamins (juice or fresh fruit) and protein (eggs, cheese, milk, or yogurt) for a good start to your day.