And because the impact your phone has on your sleep is linked to your actions on it, rather than your exposure to the phone itself, Wilson warns that even ‘quickly’ checking something is probably enough for it to take its toll.

“It really depends on the individual and their sleep genetics – whether they have a way of allowing their mind to wander after looking rather than focusing on whatever they’ve just seen,” he says.

So, the next time you go to check your phone in the middle of the night, have a think about whether it’s really necessary. Sometimes, going on social media or texting a friend is exactly what you need to feel less anxious or alone – but if you want to get back to sleep quickly, it seems like your best bet is to steer clear from technology.

Phones and sleep: why scrolling on social media when you can’t sleep is a bad idea