Sleep as Android has a CAPTCHA mode that prevents you from shutting off the alarm without some form of verification, like solving a math problem or scanning an NFC tag or bar code.

I struggle mightily with mornings and have been late to work countless times because I can unconsciously shut off my alarm. But with the CAPTCHA mode I can’t shut the alarm off without physically getting out of bed, carrying my phone into the other room, and scanning an NFC tag. It’s been a life saver.

I haven’t seen such a feature in any other alarm app.