you brain will be trained to follow a routine upon hearing the alarm. You’ll wake up on auto pilot, no matter how tired you are.
I did this every morning in high school. It also helps to immediately take a shower. I never understood why my peers would just go back to sleep and I didn't, but I suspect this is why.
I think there are many ways to jumpstart your system like you do with your shower. For me, it's a tall glass of water. I do have a (single) cup of coffee later on in the morning but right when I get up, get to my desk (work from home), i down a glass of water as I check HN, email, etc. It really starts me up.
I did this every morning in high school. It also helps to immediately take a shower. I never understood why my peers would just go back to sleep and I didn't, but I suspect this is why.