My contest entry, when I was younger I sometimes would dream of being violently attacked by some creature in the dark.
Allowing a bare hand or foot to stick out over the edge of the bed would most certainly be a death sentence.
I tried to make it looked deformed, as though the reason they dwell under beds and in closets is due to being too vulnerable to be out in the open, but in the dark where our sense of sight is impaired they would be extremely dangerous. Its back legs are weak, but it possesses phenomenal upper body strength to pull human-sized prey down and tear into them with razor sharp talons to get to the precious bone marrow.
Its eyes are designed to see in the dark, as such they are completely blind during the day. Their mouths are filled with dozens of rows of teeth in order to grind bone.