There is a computer game called "Silence of the sleep" and I wonder, why "the sleep"? How would you understand it without the article (and do you understand it now?)
In addition I was searching in the dictionary and found that when the sleep refers to a period of sleeping, it is used as a singular countable noun:
I had a little sleep in the afternoon.
She was woken from a deep sleep by a ring at the door.
But I simply cannot tell the difference between the mass noun sleep:
I didn’t get much sleep last night.
Her eyes were red through lack of sleep.