Having a gritty feeling in your eyes upon waking is usually normal, but if it’s new, pay attention. If your eyes aren’t always dry, it could actually be due to your diet. A late night out eating salty foods and drinking alcohol can dehydrate your whole body, eyes included.Having a gritty feeling in your eyes upon waking is usually normal, but if it’s new, pay attention. If your eyes aren’t always dry, it could actually be due to your diet. A late night out eating salty foods and drinking alcohol can dehydrate your whole body, eyes included.