A new study led by researchers at Imperial College London and analysing data from more than 26,000 adults in the UK Biobank found that individuals who identify as “evening types”—those who go to bed later and wake up later—consistently outperformed “morning types” on tests of memory, reasoning and reaction time.

The evening-types scored roughly 13.5 % higher on one group and about 7.5 % higher in another, compared to early risers.

The study suggests that the link between later bedtimes and higher cognitive performance may reflect underlying chronotype differences, rather than simply behavioural choices.

However, the authors caution that this does not mean everyone should shift to later bedtimes—getting 7–9 hours of sleep remains key, and morning people still do fine.

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