As psychology teachers, we’re often at the front and centre of mental health discussions – with students and also with colleagues. We teach our students about the biological, cognitive, and social explanations of disorders, the effectiveness of SSRIs, and the transformative power of CBT. And yet, one of the simplest and most effective interventions remains woefully underemphasized: adequate sleep.
There is a mountain of credible, published research highlighting just how significant sleep is to emotional regulation. We have compelling evidence showing that poor sleep isn’t just a symptom of anxiety or depression, it is often the primary cause.
The relationship between sleep and mental health is bidirectional, creating a vicious cycle: insufficient sleep heightens emotional reactivity, disrupts rational thought processes, and increases vulnerability to stress, making individuals more prone to anxiety and depression.
One night of sleep deprivation leads to a significant spike in anxiety and low mood the following morning. Chronic, ie longer term, sleeplessness makes everyday events feel more negative, reinforcing a bleak outlook on life. Research shows that individuals suffering from insomnia are at twice the risk of developing anxiety or depression compared to those who sleep well.
The evidence is compelling. Sleep deprivation impairs the prefrontal cortex, the brain’s emotional regulator, weakening its connection to the amygdala, which governs fear and emotional responses. This disruption makes individuals more emotionally volatile, prone to misperceiving neutral events as negative, and more likely to spiral into stress and mood disorders.
As educators, we must recognize the immense potential of sleep education as a preventative mental health strategy. A CAS project that focuses on sleep awareness could help students (and colleagues) track their sleep, analyze its effects on mood and cognitive function, and share findings with peers.
Getting sufficient sleep is not about school starting later or school providing quiet spaces for rest. It’s about teaching students, their parents, and colleagues that the simplest treatment (and prevention) strategy relating to the most common mental health issues of anxiety and depression is getting sufficient sleep. In general we all need 8-9 hours of sleep, so we must go to bed more than 8-9 hours before the required wake-up time because we need about half an hour to ‘fall asleep’. We all need to be in bed, light off and phone off around half an hour before the sleep time.
Ultimately, if there is one piece of mental health advice we can give our students—and even our colleagues—it is this: Prioritize sleep because it is the foundation of emotional resilience, cognitive function, and overall well-being.
Tom Coster - Psychology 
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