Stop waking up at 3 a.m. — these sleep gadgets promise to add an hour of rest and actually make you feel fresh in the morning

A split image: left, a close up of a hand checking her sleep metrics on a smartphone. Middle, the Soundcore a30 sleep earbuds in their case. Right, sleep tech expert Eve Davies lies in bed wearing an Apple Watch sleep tracker.

Sleep matters. It affects your mood, focus, motivation and long-term health. Yet many of us struggle to get enough of it.

The best sleep trackers can help you understand what’s happening overnight and research suggests we’re more likely to improve habits when we measure them.