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Scratch that. My alarm didn't go offI feel like this hasn't always been happening (or I don't sleep as soundly as I did). Anyway here's how I fixed it on my LG G4:
P.S. Every time I leave this page to check what the process is, it resets back to a blank "post reply" block. Very stupid!
- Set the notifications to 'do not disturb' scheduled for the duration of your sleep time
- Select "Calls and Notifications" and set it to "none"

You can find this in 'Sounds and Notifications -> Do not Disturb -> Enables as Scheduled'. You can also check the Exceptions below (e.g. to allow Alarms).