3. You could lose sleep
Caffeine is a stimulant that is most often used to keep you going during an often tiresome day. And, most people know this, and drink willingly. That being said, if you drink, say, later in the afternoon, you can expect to be wide awake come bedtime.
In fact one study found that consuming caffeine 6 hours before bedtime reduced total sleep time by one hour. These effects also can be stronger in older adults because It takes their bodies a longer time to process the caffeine.