For context, I'm 17 so my recommended sleep amount should be 8-10 hours according to Sleepfoundation. I find myself rested more with about 9-10 hours.
So, I am a true believer in morning routines and this includes waking up early, so I tried to wake up early a few times (for "few times" I mean like 1 week then another 1 week) and I did it with obv having a morning routine, which mainly included a walk. The problem is that even if I slept 9 hours (can't sleep more than that because I was waking up at 6, and having dinner with my family) after like a week and a half I felt really tired. So waking up wasn't about motivation or a schedule to follow, but just the fact that I wasn't rested enough for the day.
On the other side, now I sleep like 9.5 hours, waking up at 7:30 and I feel much more rested.
In both cases I use an alarm clock. How is that I'm more rested in the latter case than in the first? Also is there any scientific evidence?
Thanks a lot!