If you’re not getting enough sleep, it’s difficult for your body to perform at its best. When you’re tired, your muscles won’t operate at peak strength and you’ll find it harder to get motivated to work out. This not only means that it will be difficult to exercise at your top level, but you’ll also be more likely to suffer an injury. Adults should try to get between 7 and 9 hours of sleep each night if they want to perform at their best. However, if you are frequently doing intense workouts, you may need more. Listen to your body and, if you feel very tired, you’re likely sleep deprived.