Lisa Kilgour, Nutritionist November 2, 2018 Health Tips, Newsletter, Blog 4pm Exhaustion Explained Lisa Kilgour, Nutritionist November 2, 2018 Health Tips, Newsletter, Blog You know the feeling…you’re feeling pretty okay all day. Ya, maybe you’re not at 100%, but you’re a solid okay. And then, around 3 or 4 pm, your energy crashes. You’re suddenly foggy, tired, and have a bad case of the “I don’t wannas”.