Coffee doesn't help me, I usually drink cocoa with milk. It's a healthy way to fight sleepiness, unlike caffeine pills, energy drinks, etc. Try exercising as well. Physical activity stimulates the production of the hormone adrenaline, which promotes awakening.
Sleepiness can be different cases, it is not sleepy, lack of vitamin or overwork. In my case, the tests showed a lack of vitamin D. They prescribed Detrimax, not immediately, but it could be. Plus, we began to walk more often in the fresh air!