The Claim
Among employed adults aged 19–50, daily caffeine intake averaging 262.5 mg is significantly associated with poorer sleep quality as measured by the Pittsburgh Sleep Quality Index (PSQI), with higher intake linked to reduced sleep duration and increased nighttime disturbances.
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.
Adults aged 19–50 who consume about 262.5 mg of caffeine daily have worse sleep quality, shorter sleep duration, and more nighttime awakenings compared to those with lower intake.
See the scientific wording
Among employed adults aged 19–50, daily caffeine intake averaging 262.5 mg is significantly associated with poorer sleep quality, as measured by the Pittsburgh Sleep Quality Index (PSQI), with higher intake specifically linked to reduced sleep duration and increased nighttime disturbances, suggesting that caffeine consumption patterns may contribute to widespread sleep disruption in working populations.
Caffeine enters the brain and sticks to sleep-signaling receptors, stopping the natural buildup of sleep pressure. This keeps the brain alert, prevents deep sleep from starting, and causes frequent awakenings during the night, leading to less total sleep.
What the research says
1 studyThis study found that adults who drink about 260 mg of caffeine a day—like from coffee or tea—tend to sleep worse, getting less sleep and waking up more at night. It directly links caffeine to poor sleep in working people.
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.