 Social jet lag, SJ, which occurs when sleep timing irregularities from social or occupational demands conflict with endogenous sleep wake rhythms, has been linked to poor mental health. However, the underlying mechanisms are still unclear. A recent study found that impaired ability to recall extinction memories, which is seen in certain psychiatric conditions, could be a possible explanation. The study also showed that greater SJ was associated with a tendency towards morning chronotypes, suggesting that this type of sleep disruption may be more detrimental for those who prefer to wake up early. This article was authored by Ryan Bottery, Tony J. Cunningham, Rebecca M. C. Spencer, and others.