You could tweak this until the cows come home, but there's nothing there to really make a reader stumble and not reach the next paragraph. That's the enemy to avoid. It's very easy to overthink things at times ;-)
If you feel the need to carry on torturing yourself, here's a small variation which simply avoids the woken/wake double. Nearly all your own words, just smoothed out a little.
"In the eleven months since the death of his wife, Marcus Hartley had woken each morning on soaked pillows and tightly swaddled in his bed linen. In a total panic, as though he had neglected some vital task. For several minutes he would stare into the darkness, pulse thumping in his ears, trying to remember what he’d forgotten."
Gyppo