Missing critical appointments due to alarm failures causes real professional and personal consequences.
Build an alarm with multiple independent trigger systems (sound, vibration, lights), automatic failover, and verification that the user is actually awake.
Target doctors, pilots, and other professionals who face severe consequences for tardiness.
MVP could be a basic alarm with redundant notifications and optional IoT device integration.
Risk is competing with free built-in solutions that are 'good enough' for most users.