The Claim
A 100mg dose of caffeine administered at bedtime prolongs sleep latency and reduces sleep efficiency in healthy young adult males.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Taking 100mg of caffeine at bedtime increases the time it takes to fall asleep and decreases the percentage of time spent asleep while in bed for healthy young adult males.
See the scientific wording
A 100mg dose of caffeine administered at bedtime prolongs sleep latency and reduces sleep efficiency in healthy young adult males, indicating a measurable disruption in the ability to initiate and maintain sleep.
Caffeine enters the brain and sticks to sleep-promoting receptors, preventing the natural buildup of a chemical that tells the brain it's time to sleep. This stops the brain from generating the slow, synchronized electrical activity needed to fall asleep and stay in deep sleep, making it harder to fall asleep and reducing total sleep time.
What the research says
1 studyStudy: Caffeine Reduces Low-Frequency Delta Activity in the Human Sleep EEG
Taking 100mg of caffeine before bed made it harder for young men to fall asleep and caused them to sleep less overall, according to this study. So yes, caffeine before bed messes with sleep.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.