Neuroscientist Explains: Why You're Always Tired (and How to Fix It)

Summary

Dr. Sahar Yousef explains that feeling tired despite getting eight hours of sleep may be linked to bedtime habits, working against your natural body clock, or consistently missing out on deep sleep. Her central message is to build routines around your biology and help your brain associate bed with rest—not work, scrolling, or planning.

Key Strategies

• Keep phone use out of bed. Scrolling, checking email, or reviewing tomorrow’s plans can keep your mind active and teach your brain to associate bed with strategic thinking.
• Work with your chronotype. People naturally differ in their preferred sleep and wake times. Some are morning types, night owls, or have two daily energy peaks. Rather than forcing a generic 5 a.m. routine, schedule sleep and demanding work to better match your own rhythm.
• Protect deep sleep. Yousef relays sleep scientist Els van der Helm’s view that deep sleep helps the brain process the day’s emotional stress. Regularly cutting it short may make everyday frustrations feel harder to manage.
• Use your peak-focus window. Identify the two-to-three-hour period when your concentration and energy are naturally strongest, and reserve it for your most demanding work. The video cites McKinsey research in support of prioritizing this window.
• Create an end-of-work ritual. Use a consistent cue—such as a particular song or relaxation playlist—to signal that work is over and it’s time to wind down.
• Make a phone drop-off spot. Leave your phone in a basket or bowl before starting your evening routine, ideally outside the bedroom, to reduce the temptation to check it.
• Keep bed for sleep and sex. If you find yourself planning or worrying in bed, get up and move to another room. Write down your thoughts, then try a calming activity such as stretching, meditation, herbal tea, relaxing music, or reading. Return to bed when you feel sleepy.
• Try a simple first step. Put a phone basket outside the bedroom and leave your phone there before going to bed.

Presenters and Sources Mentioned

• Presenter: Dr. Sahar Yousef, cognitive neuroscientist at the University of California, Berkeley.
• Dr. Els van der Helm: Sleep scientist and author of Sleep Intelligence.
• 2017 Nobel Prize in Physiology or Medicine: The researchers behind work on the molecular mechanisms of circadian rhythms are discussed, but not named in the subtitles.
• McKinsey research: Cited regarding productivity during peak-focus hours.
• mychronotype.com: Suggested as a resource for identifying chronotype.