If you’re sure you’re getting the rest that you need, and you’re drinking enough water, check your diet next.
A diet high in junk foods such as high sugar and refined flours, and those containing a lot of saturated fats or trans fats can derail your energy fast.
So if you’re eating a lot of processed or fast foods, you may have found your culprit.
Try to balance your diet with more fresh foods, in particular, fruits and vegetables.