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I like this feature of another alarm app where it sends a wake up check notification after a preset time once the alarm has been dismissed. It requires me to tap the notification and confirm I am awake, else it will make the alarm ring again and then do a wakeup check notification again.
This is great because unfortunately I have gotten so good at the captcha, I just do it to dismiss the alarm and fall back asleep. I could choose a new harder captcha, but at the same time the wakeup check is a nice feature for peace of mind. Also prevents for example unintended falling back asleep even if somebody woke up for at least a few minutes but was very tired.