recurring dream?

i keep getting this same dream. not every night but quite often.

its a lucid dream where i'm fully in control and im in a room with no apparent exit. after a short time a floating skull starts floating around. its really fragile and cracks at the slightest touch and if it fractures another come to replace it. and it just goes on till i wake up.

im not one for attributing meanings to dreams but this was f'kin weird :/ its kinda fun but creepy.