After a bad night everything weighs more: we get irritated over nothing, take everything personally, and struggle to see the good side of things. It’s not just a feeling: it’s the brain that, without rest, changes the way it feels emotions.
In 2007, in the journal Current Biology, Seung-Schik Yoo, Matthew Walker and colleagues showed what happens inside us after a sleepless night. The amygdala — the brain’s emotional center — reacted to negative stimuli with an amplified intensity of about 60%. Why? Sleep deprivation weakens the dialogue between the amygdala and the prefrontal cortex, our rational “brake.” In practice, without sleep the emotional brain revs up and the clear-headed one struggles to calm it. That’s why, when we’re tired, we react in a way we later don’t recognize as our own.
The good news is that sleep can be cared for like a precious habit. Keep your hours as regular as possible, even on weekends. In the last hour before bed, dim the lights and put the screens away, so you don’t fool the brain with daylight. Keep the room cool, dark and quiet. And keep coffee far from the evening. These aren’t textbook rules: they are small acts of mood maintenance.
Sleep is not wasted time: it’s how the brain repairs the day’s emotions. Taking good care of your sleep is, in the end, an act of kindness toward the person you’ll be tomorrow.
Sources
- Yoo, S.-S., Gujar, N., Hu, P., Jolesz, F. A., Walker, M. P. (2007). The human emotional brain without sleep — a prefrontal amygdala disconnect. Current Biology, 17(20), R877–R878.
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