[closeparen]

Most people need to be somewhere at a specific time in the morning; a variable alarm clock doesn’t make much sense unless they also leave a huge buffer. But for childless tech workers who can roll into the office any time before 11am standup... absolutely.

[orev]

A 30 minute window really isn’t that big of a deal. You just set the end time to when you need to be up, and then if it goes off before that, then you wake up refreshed with a little extra time. Your choice is really whether you want to get up refreshed, possibly a little early, or wake up abruptly in the wrong cycle and be groggy all morning. Either way, the solution to getting more sleep is to go to bed earlier if you have a fixed time to wake up.