I've been an on and off insomniac since I was very little for various reasons. My observations on tiredness:
1: Masturbation and Sex result in tiredness, if I've done either the night before I don't feel 'fresh' when I wake up, but tired.
2: Same with alcohol, weed + many drugs, with the exception of things like shrooms.. speed, e, mdma UNTIL the comedown.
3: Same with fatty foods like pizza.
4: When my mind and body feel healthier I sleep better and feel better the next day.
5: Sleeping for longer than needed periods of time causes me to feel tired when I do wake up.
6: Continuously drinking caffeinated substances can result in continual tiredness/fuzzyness.
7: Sadness, depression, unhappy states of mind contributes to tiredness, limited energy levels.
8: Tiredness causes sadness, depression, unhappy states of mind - like 85% of manic depressive episodes occur as a consequence of tiredness, adverse sleep patterns etc.
So obv. to be less tired do the opposite/dont do those things.