I go thru this every pregnancy...around the same stage too - 25-27 weeks. I can take up to 2 hours just to fall asleep at night....then i wake up at 2am, 3am....etc eetc. I find my mind really active...like im compiling a shopping list in my head or im organising what to do for my birthday in 9 months time - LOL. Really stoooooopid stuff.