What is the latest time you can have coffee without ruining your sleep?
                                
                                
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                                    5 min read                                
                            
                                Studies show that caffeine consumption as little as six hours before bedtime can reduce total sleep time by over an hour, even if someone doesn't realize it. This means that a late-afternoon caffeine boost might be the reason for restless nights. Understanding caffeine's timing is key for both energy and restful sleep.