Type 1 and type 2 are different conditions so my experience may not be the same as yours.
I find that high and low blood sugars make me feel tired.
If my blood sugars are between 4.5 and 7.5, I have as much energy (if not more) than my friends, family and colleagues of a certain age.
So, assuming this is the same for someone for type 2, I would suggest reviewing your levels (if you have a meter and can check) and look at how to reduce (or increase ... depending upon what medication you are on) your blood sugar levels.
If you are not on any medication, diet is the key for reducing levels.
And, for everyone (regardless of diabetes), exercise has wonderful benefits including reducing blood sugar levels and general well-being.