Bed's temptation

I afflicted sleepiness after work recently. I have to study more because I have the exam of business marketing next week! But I couldn't stand the
bed's temtation.

Even if I drunk some coffee before learning, my eyes became heavier and heavier soon. Therefore I tried to take short sleep and I refresh my brain, then I study hard, I think.

But once I went to bed, next time I woke up was in the morning. Was this caused by my age? I definetely felt my sleepiness was strong than what I was.