Consuming protein before sleeping has been shown to have no effect on sleep quality. However, if a protein shake contains a lot of sugar, it can potentially delay your sleep due to the sugar rush. To prevent this, simply drink low-sugar protein shakes. Also, don’t drink too much at once or consume the wrong variation of protein, such as having a whey protein shake if you’re lactose intolerant. It can upset your stomach or cause bloating, making it difficult to get rest.