About waking at 8:00 AM
Eight is a late-start, remote-work or student alarm, and for genuine evening chronotypes it is simply the right time. Late risers are not undisciplined; the distribution of natural wake times in adults is wide and largely inherited.
Leave the tab open
A browser alarm can only ring while its page is open. It does not have to be the tab you are looking at, and on a desktop it does not have to be the window in front — but closing the tab or quitting the browser stops it. For anything you genuinely cannot miss, set a second alarm on your phone as a backup. That is true of every browser-based alarm clock, not just this one.