I committed to living without an alarm clock in college, 20+ years ago. I fought long battles with my snooze button, and realized I was spending hours each morning hitting the snooze button. I realized if I just didn't set an alarm I'd probably get up later than I usually set my alarm for, but earlier than I typically got out of bed. It worked; I started waking up refreshed, and happy to get out of bed in the morning.
When I had an important exam or something else I really didn't want to miss, I'd set an alarm for a while. But then I just went all in, and never set an alarm. That made me pay more attention to when I was going to bed at night, and the quality of my sleep. When I started working I would set an alarm for about half an hour after I typically woke up, just in case, so I wouldn't be late for work. But after six months of that, I stopped setting my backup alarm as well. I was late for work maybe twice in five years, and it was never significantly late, and it was at times where my body really needed sleep and it probably helped me avoid getting sick. These days I only set an alarm if I have to catch a 6am flight, or if I'm getting up super early to climb a mountain or something.
If you're battling your alarm every day, I highly encourage you to experiment with not setting an alarm.
This doesn't work for me. Left to my own schedule, I go to bed later and later and wake up later and later.
The thing that works for me is waking up (with an alarm) every day at the same time (6 o'clock) including week-ends.
I have a "dawn simulator" clock so most of the time I'm already awake when the alarm rings. But no matter what, when it rings I get out of bed immediately. You snooze you loose!
I think the key point from OP was paying closer attention the when they went to sleep.
If you know you have to be up by X then be sure to go to bed at X-Y. I would imagine the struggle is winding down for bed early rather than waiting till you "feel tired" to go to sleep. Artificial light and stimulation makes it easy to stay up way later than intended.
For me, it's easier to wake early than sleep early. Whatever I want to do after midnight, I can do before dawn. And that plays into the artificial light thing of waking me up.
Once you're tired from waking early, you're far less likely to look at your phone too late.
Luckily I went through a similar experience in college, so when I got rid of the alarm I slowly but surely looped around a bit, until I got the napping right.
However - then I started a job where I had to travel between time zones, and I still haven't figured out how to get the body to know that it's traveled quickly other than mealtime & nap manipulation the day before, and even then I still need alarms.
I tried doing this in college too but it broke down immediately. The way coursework and exams are conducted almost forces you to burn the midnight oil and sacrifice sleep for forcing another three or four things to memorize into your head.
That’s what it felt like, like I had very limited time to shove x amount of things into my brain which only processes at y rate, so if I had too many things to shove in at a time due to taking a full courseload, that meant staying up since I cant change the rate my brain digests information without abusing stimulants like some of my friends.
So then you end up with a few nights of 5 hour sleep which you pay for by sleeping for 13 hours on the weekend. Not healthy, but it became a matter of necessity due to also having to make time for a part time job.
The linked article is part of research on optimal learning. The proposed schedule will get a lot more out of your time. It's usually better to do your studying super early in the morning rather than late into the night, and proper sleep helps a lot with information storage. YMMV though; some people are naturally better in the evening, or sometimes daytime schedules just don't fit someone's lifestyle.
I had a similar college experience to the parent post. 8am classes every day and late night lab classes every other day. This schedule prevented me from having any time in the morning to study and pretty much forced an erratic sleep schedule on myself. Lots of quick naps in between classes.
When I had an important exam or something else I really didn't want to miss, I'd set an alarm for a while. But then I just went all in, and never set an alarm. That made me pay more attention to when I was going to bed at night, and the quality of my sleep. When I started working I would set an alarm for about half an hour after I typically woke up, just in case, so I wouldn't be late for work. But after six months of that, I stopped setting my backup alarm as well. I was late for work maybe twice in five years, and it was never significantly late, and it was at times where my body really needed sleep and it probably helped me avoid getting sick. These days I only set an alarm if I have to catch a 6am flight, or if I'm getting up super early to climb a mountain or something.
If you're battling your alarm every day, I highly encourage you to experiment with not setting an alarm.