Energy drinks and other high-caffeine beverages can cause you to crash later in the day when their effects wear off. On average, the effects of caffeine will last for about 5 hours. The best way to avoid a slump after consuming caffeine is to make sure that you're getting adequate rest and not using energy drinks to push through without enough sleep to stay healthy. Consume energy drinks with food to avoid an upset stomach and help the caffeine wear off slowly and steadily, rather than all at once. Drinking more than 200mg of caffeine in one sitting is more likely to cause a crash, so it's better to sip energy drinks slowly. If you need some energy drinks to give you a boost or help you focus, you can order just what you're after through Instacart. Fill your cart and order now for same-day delivery right to your door.