Late-night caffeine and midnight feasts are known to disrupt our sleep — but experts are warning that something else is driving restless nights.

Posting on social media shortly before bed can delay the time it takes for people to fall asleep by up to three hours, according to a study by Duke University.

The researchers of 50,000 people found those who posted on social media within an hour of their bedtime were nearly twice as likely to stay up late.