Here is a hammock that lets you get some sleep under your desk. The Under Desk Hammock is made for UPLIFT desks. You can clip it onto your desk with the included carabiners. No drilling required. The Under Desk Hammock is made for desks 72″ wide. It has 200lb max weight capacity.
This desk hammock is made of 210T Nylon. It ships with 2 carabiners and 2 ropes. You can find out more about it here.