Caffeine masks tiredness
up:: Sleep MOC Stimulants like caffeine block the adenosine receptors. That dampens the buildup of Sleep Pressure which we need to sleep deeply.
Caffeine is in coffee, tea, cola and energy drinks, even decaf coffee still has caffeine. It has a half life of six hours.
its typically best to avoid caffeine for least 10-12 hours before bedtime.
- Huberman
Related: Coffee