Try drinking warm water with lemon juice and ginger instead of coffee; this mixture also has invigorating properties. Maybe you should contact a doctor and he will tell you the reasons for the eternal sleepiness?
I will assume that you want to sleep precisely because of drinking coffee. A kind of vicious circle. Here is more about the mechanism of action of caffeine https://thequestion.ru/questions/154547/kak-skoree-zasnut-esli-khvatilo-uma-vypit-kofe-na-noch. This is because coffee does not "invigorate" in the sense of "acceleration". That is, caffeine does not speed up the brain, but only blocks the neurotransmitter of pleasant fatigue and sleep (adenosine). Caffeine replaces adenosine in the cell and is 'stuck' there for 3-6 hours. All this time, adenosine does not work, but accumulates. And when the caffeine molecule is washed out of the brain cell, a wild amount of adenosine will rush into this cell, which will inhibit the processes of the brain, 'prepare the brain for sleep'. In addition, the brain will increase the number of such adenosine receptors the more, the more you consume coffee. The effect will intensify. So as soon as you endure the withdrawal from coffee, such unpleasant effects will quickly disappear by themselves. More details on the wiki. Good luck, hugged
Why do you overlook the fact that coffee contains theobromine in addition to caffeine? Theobromine acts exactly the opposite - calming and lulling. And there are people who are more sensitive to caffeine, and then to theobromine. I’m just a representative of theobromine people. I have a cup of double espresso and go to bed))) Video to help you. Maybe we should just move away from theobromine, switch to pure caffeine tablets (this is not very good), switch to green tea, mate, ginger drink.
The most effective way is to eliminate the cause! Illness, lack of sleep, go in for sports!
But, since this is impossible to do, due to the circumstances, the main thing is to stimulate the brain with invigorating information for thought, listen to music that turns you on, watch a movie where there is a lot of sun, find a motivator - now I will do this and that, and then I will get high on the results!
And in the army, in order not to sleep, I just ate at night! The stomach worked and interfered with sleep, energy came in. And it's hard to sleep in the cold. For me, washing my eyes with ice water and breathing cold air has the same strong effect as coffee!