iv tried to attain lucid dreams by sleeping in the afternoon, but often times my mind is blank and i wake up having wasted the time, i also tried sleeping with a light on but only ended up with a headache and tired eyes in the morning. Can someone help me and be more general on how to become lucid, and explain to me their experiences and comments on how real it could be.

I also recall something from my memory about what i think was a lucid dream i had before but do't knoe much about it. I was dreaming myself to be in a world with nothing but trees, and i would go around sucking something out of the trees with my hands and then firing those fireballs from dragonball z (yea i was little then and was a big fan, lol) Then suddenly i realized it was a dream, i was still in the dream, and tried to fire those fireballs again, but i coulnt fire them anymore and seemed to have lost all power, i just kept thinking about things and woke up in confusion...

how do i keep control after becoming concious?