When we think of hair loss, we have to focus on the most common factors impacting hair loss. Stress may be one. A hormone imbalance could be another. Still other times, it is genetics that causes that thinning hair to happen. Yet, there are other causes, many of which we may not easily recognize. A lack of sleep can affect hair growth. For many, this is a very common problem – getting consistently good sleep. It can impact all areas of your health. But how does poor sleep lead to hair loss?