Nightly Clock is a Night Time Clock Application with Alarm, built in Alarm Sounds with ability to choose your own and stream a supported Audio File from the Internet, many Clock Colours to choose from, Four Font sizes and Bold Font Toggle, you can show your own message when your Alarm goes off and you can even choose your own Wallpaper for the App. Last but by certainly no means least it comes with an Interval Alarm feature, with this you can set your alarm to sound for a certain amount of time then automatically silence itself, it will then wait a set amount of time and will sound fully (If set to sound once). Nightly clock is a truly customisable Night Time Clock, give it a try, you won't regret it.
Supported Devices: Sailfish OS 3.01.11+ ARM
If you are experiencing problems installing please try the pkcon refresh command from the terminal, as some devices are missing the qt5-qtlocation library needed for the weather side of the App