It's five o'clock in the morning
And I haven't slept at all
Or: And I haven't slept a wink
Thinking about your beauty
I'm going to end up crazy
The insomnia is my punishment
Your love will be my relief
I knew your boyfriend well
Small and not good-looking
And I know that he doesn't love you
Besides, you don't love him
Because he doesn't measure up
'Dar la talla' = to be up to par, to measure up, to make the cut
He doesn't know how to please you