The Northern Irish band's new single, which is the follow-up to last year's 'What You Know' and the first from the band's upcoming album Beacon, was featured on Zane Lowe's Radio 1 show tonight (July 19).
Following its premiere, 'Sleep Alone' is now available as a free download for 24 hours from the band's website, and is available to stream on Soundcloud and YouTube.
'Sleep Alone' is available digitally from July 21, and on vinyl from September 3, alongside the release of Beacon.
Discussing the upcoming album, which was recorded in LA with producer Jacknife Lee (Bloc Party, U2), Alex Trimble said: "Beacon is a much more intimate record than our first, but at the same time, it's much bigger and more inclusive.
"Working with Jacknife Lee was a joy and a pleasure. He shared our goals and played a huge part in putting the pieces together in the right way."