Night owl and early bird brain differences run deeper than when you set your alarm. If you stay up late and always have, you are not one type of night owl, you are one of three. The first subtype has higher prefrontal cortex volume, faster reaction times, and better cognitive test scores. The second is the most vulnerable, showing strong links to depression and cardiovascular risk. And those results on cognitive ability are not one study. They are consistent across multiple studies.

Early birds split into two groups as well. The classical early bird has stable lifestyle markers, drinks less, and shows fewer health issues across hospital records with no significant cardiovascular risk. The second early bird group is linked to depression, appears not to enjoy their schedule, and reports feeling tired and sad. Le Zhou's reading: those may not be true early birds at all. They may simply be poor sleepers who identify as early birds because they wake up early.

If your parents are night owls there is roughly a 50% chance you are one too. The next phase of this research is looking at the genetic basis behind those subtypes, which means your chronotype may not be a habit. It may have been decided before you were born.

Topics: night owl early bird brain differences, chronotype subtypes, cognitive ability sleep type, early bird depression link, chronotype heritability

GUEST: Le Zhou | PhD Candidate, Integrated Program in Neuroscience, McGill University

Originally aired on 2026-02-27

Night owl and early bird brain differences run deeper than when you set your alarm. If you stay up late and always have, you are not one type of night owl, you are one of three. The first subtype has higher prefrontal cortex volume, faster reaction times, and better cognitive test scores. The second is the most vulnerable, showing strong links to depression and cardiovascular risk. And those results on cognitive ability are not one study. They are consistent across multiple studies.
Early birds split into two groups as well. The classical early bird has stable lifestyle markers, drinks less, and shows fewer health issues across hospital records with no significant cardiovascular risk. The second early bird group is linked to depression, appears not to enjoy their schedule, and reports feeling tired and sad. Le Zhou's reading: those may not be true early birds at all. They may simply be poor sleepers who identify as early birds because they wake up early.
If your parents are night owls there is roughly a 50% chance you are one too. The next phase of this research is looking at the genetic basis behind those subtypes, which means your chronotype may not be a habit. It may have been decided before you were born.
Topics: night owl early bird brain differences, chronotype subtypes, cognitive ability sleep type, early bird depression link, chronotype heritability
GUEST: Le Zhou | PhD Candidate, Integrated Program in Neuroscience, McGill University Originally aired on&nbsp;2026-02-27

Shane Hewitt & The Nightshift is your late-night companion for real talk, bold ideas, and unfiltered conversations that matter. Hosted by Canadian radio veteran Shane Hewitt, each episode dives into the headlines, human stories, and hidden truths shaping our world—always with curiosity, compassion, and a sharp edge.

From politics and pop culture to mental health, technology, and everyday life, this podcast is where night owls, deep thinkers, and curious minds come to connect. Featuring expert guests, passionate callers, and Shane’s signature style—thoughtful, fearless, and refreshingly real.

If you crave meaningful dialogue, smart perspectives, and late-night radio energy in podcast form, subscribe now and join The Nightshift.

Shane Hewitt &amp; The Nightshift is your late-night companion for real talk, bold ideas, and unfiltered conversations that matter. Hosted by Canadian radio veteran Shane Hewitt, each episode dives into the headlines, human stories, and hidden truths shaping our world&mdash;always with curiosity, compassion, and a sharp edge.
From politics and pop culture to mental health, technology, and everyday life, this podcast is where night owls, deep thinkers, and curious minds come to connect. Featuring expert guests, passionate callers, and Shane&rsquo;s signature style&mdash;thoughtful, fearless, and refreshingly real.
If you crave meaningful dialogue, smart perspectives, and late-night radio energy in podcast form, subscribe now and join The Nightshift.

Shane Hewitt and The Nightshift

Shane Hewitt is known for his engaging and relatable on-air personality, which captivates listeners. His ability to blend insightful commentary with humour and empathy creates a genuine connection with listeners.  Shane Hewitt and the Night Shift provides relatable content, informative discussions and expert insights – along with a balance of anecdotes and entertainment.

Shane Hewitt is known for his engaging and relatable on-air personality, which captivates listeners. His ability to blend insightful commentary with humour and empathy creates a genuine connection with listeners.  Shane Hewitt and the Night Shift provides relatable content, informative discussions and expert insights – along with a balance of anecdotes and entertainment.