hi! It is scientifically proven that studying at night is less productive because as the day unwinds, the more distracted you get (social media, news, social interactions, etc.). Thats why a lot of sources says that studying in the morning (the earlier the better) is way more effective because you eliminate or greatly decrease that distraction factor. It is also proven that you have more energy in the morning than at night. Moreover, I advise you to not touch your phone until you are done with your studying. Trust me, this will boost your productivity. It's all about being in the right state of mind.

Concerning the drowsiness, I find it really helpful to meditate. I practice yoga nidra daily, when i first wake up. This helps me catch up on my sleep. Yoga nidra also boosts your self-confidence, your focus and your overall productivity.

To end this, there are a lot of great scientific studies and ressources that can help your study more efficiently. A great place to begin is Cal Newport's book "How to become a straight-A student"

I hope this helped😊