Your skin cells don’t have time to repair themselves
“The evening is a time of rest and repair, when the skin heals itself from daily damage,” says dermatologist Dr Joshua Zeichner. “If you are not sleeping, then your skin will not be able to heal itself and may increase your likelihood of premature ageing.”
Breakouts can – and probably will – pop up
Your levels of cortisol (the stress hormone) naturally drop at night. But when you stay up late and disrupt your sleep cycle, cortisol levels remain high. This means your oil glands are continually stimulated, which can make you more likely to get an acne breakout, explains Dr Zeichner.
Your pores will look bigger
Another side effect of increased oil production brought on by lack of sleep is clogged and dilated pores.