These are spirit incarnations which you can only see while using special cacti products. But if you are planning any night hikes remember that the shadow people tend to want to move away or across you, they generally don't move toward you. If you see something moving toward you, freak out, that's a bear not a shadow person. Well, unless he disguised himself as a blob of undulating goo that seeped between the cracks of the puzzle-piece patterned tiles. You may notice that after about eight hours you fall asleep and wake up on a Tuesday and wonder what happened to the first half of the month.
Alarm clocks do nothing to remedy the situation.