Do I need to manually start the alarm every night?

Due to system limitations on the native smart alarm, the alarm currently must be started manually. We are exploring possible ways to enable automatic activation.

Persistent popup asking to enable background refresh

If the global Background App Refresh on the watch is turned off, Somno cannot run in the background, and a persistent popup will appear. To resolve this, please enable Somno in Settings → General → Background App Refresh.