WHY YOU'RE ALWAYS TIRED - Big Myths Ruining Your Sleep & How To Get The Best Sleep Of Your Life!

Russell Foster says the natural sleep span for humans varies widely (roughly six to about 10–10.5 hours) and warns that “the tired brain is very good at fooling itself that it’s okay.” He suggests using real-world markers (waking without an alarm, daytime energy, irritability, caffeine cravings, and sleeping longer on free days) to judge whether you’re meeting your personal sleep need.

Russell Foster describes short-term effects (irritability, reduced empathy, poorer cognition, weaker memory, lower creativity, reduced humor) and longer-term risks including microsleeps and major safety hazards. He also connects chronic tiredness to sustained stress-axis activation and downstream health impacts.

Russell Foster says 97% of night-shift workers do not adapt because the circadian clock “defers to the brighter light signal” as daytime. He discusses the WHO classification of night shift work as a probable carcinogen and proposes mitigation strategies such as better safety measures for commuting, more frequent health checks, appropriate food options overnight, education for workers and families, and matching shifts to chronotype where possible.

Russell Foster cites work comparing cognition at 4:00 AM with alcohol impairment: at 4:00 AM, information processing can be worse than being legally drunk. He explains microsleeps as unpredictable, uncontrollable episodes of sleep and shares examples of catastrophic consequences when fatigue undermines performance and decision-making.

Matthew Walker explains caffeine’s long persistence: with a noon coffee, a quarter of the caffeine can still be present at midnight; he also cites a study where evening caffeine reduced deep sleep by 20% even when people felt they slept fine. He adds that alcohol sedates rather than produces natural sleep, fragments sleep, and suppresses REM sleep, which he calls important for “emotional first aid.”