I try

I promised I'll do it right this time
Grip it tight and stay up all night
Keep the sheets open
though it's always temptingly toasty in here like an oven
Do this sitting up hopefully not slipping off
It's hard but I've got to ride it and keep it up
hanging on to the bed poles
praying that they dare not close
The hard top sliding off my wet palms
my eyes closing with no such qualms
trying hard, but still slipping
and in the end, I knew it
I was falling asleep just a bit
My textbook hit the hard floor with a thud
and tonight again, study I could not