I have three alarms, each offset by a couple of minutes:
i) Old Phillips radio/alarm clock, mains powered. VERY LOUD. People shouting in my room will always wake me up.
ii) Little battery powered alarm clock with an annoying pattern of bleeping. I put it at the bottom of my stairs, so I have to get up, leave my bedroom and go downstairs to turn it off.
iii) BT alarm call. Even if there's a power cut and the batteries on the second clock run out overnight, the phone in my bedroom will wake me up.
i) Old Phillips radio/alarm clock, mains powered. VERY LOUD. People shouting in my room will always wake me up.
ii) Little battery powered alarm clock with an annoying pattern of bleeping. I put it at the bottom of my stairs, so I have to get up, leave my bedroom and go downstairs to turn it off.
iii) BT alarm call. Even if there's a power cut and the batteries on the second clock run out overnight, the phone in my bedroom will wake me up.