I've been upright since 7.22 a.m., the time science says is the best time to wake up. It's now 11.34, and I am still not fully awake.
Reason: lack of caffeine. It takes me 1 coffee, or 3 green teas to become fully awake. So far, I've had 2 teas. No coffee. Sheldon takes at least 3 coffees to come fully awake.
Gone are the days where I could hit the ground running 5 days out of 7. I can still do it if I have to, but I tend to hit the wall far earlier, and a lot harder. I blame my kids. All 3 of them hated school, so I had to battle every day to get them out the door, this killed my ability to go go go without any help. It just took a while to hit.
If I ever get a job that requires me to fire on all cylinders early, I'll revert to having a coffee every morning. I'll need to, at least in the beginning. My kidney will hate me, but my brain will be (mostly) functional. Mostly....