Any chance you have ADHD? I learned (far later in life than I would have liked) that I have ADHD and that it is one of the biggest reasons I'm almost always tired or even exhausted. Brain's just thinking too hard/inefficiently. (I have other contributing factors, but this one is significant and fairly obvious). Still can't get treatment, but the awareness has helped me work around it somewhat, by removing stressors and taking time to relax and/or hyperfocus.

Have you been tested for sleep apnea? This can affect even people who aren’t overweight.

I've been reading about health and all of this stuff for a bit now. Some things I learned...

1. Sleep is massively important. Not getting enough, sleep Apnea, and other things that mess with sleep will lead to feeling tired.

2. Diet matters. What most people consider healthy is often not all that healthy. You can read about the gut/brain connection. To keep the gut in healthy shape you needs plenty of fiber and micro nutrients found in things like vegetables and whole grains. Doctors aren't trained much in this stuff but nutritionists are.

3. I personally found that drinking too much coffee lead to it. I almost needed the coffee to feel awake. When I broke myself of that (I have limited amounts of coffee now) I had more energy. I cut off coffee cold turkey. Was not fun.

4. ADHD can lead to feeling tired.

In the last couple years I've had to overhaul my diet due to sudden onset of all kinds of food allergies since COVID. I used to be chronically tired especially in the afternoons. I now eat very little sugar and no corn syrup/HFCS at all and I've made two interesting observations: My cravings for sweets are virtually zero and my energy levels are stable all day.

There are exceptions but for the most part I'm almost never tired during the day anymore unless I worked out a lot. My energy isn't exactly bouncing me off any walls but it's a noticable improvement.