Hatches. Some have creaky sail ripping support arms. Many have nothing. Some have friction hinges to hold the dang thing open. Mine has nothing. Fine for passing sails through without a rip. Not so good for holding open when you're sleeping below.
1) Low-tech: Get a cheapie clamp, clamp to the deck and coat the other end to hold the thing open.
2) Expensive: Replace the hatch with a new friction hinge, and Ebay the old one.
3) Sweat like a dog and hypnotise yourself into thinking this is fun