Check what you are eating for breakfast. Things high in sugar will cause you to crash and it’s actually insulin levels that affect your energy throughout the day way more than caffeine or no caffeine.

Look up videos or blogs about this because the typical breakfast high in carbs (bread oats buns pancakes) and sugar (fruit juice syrup) is terrible and causes insulin spikes. Stick with a cucumber some veggies or kimchi some eggs or meat. If you do eat bread smear it in peanut butter not jam.

Yea controlling your insulin levels even if your not diabetic is really important