Basically, that’s what 12-hour night shifts feel like, especially if it’s 3 to 4 days straight.
First, your body adjusts to the changes, fighting the urge to fall asleep. Your eyes may remain open, but you can’t fool your body as it slowly withers away. Reflexes starts to slow down. Your muscles begin to relax. But you can’t give in to the demands of your body because your work requires you to stay awake.
Then comes the morning at last. It’s time to go home. Suddenly, your body is awake. You want to sleep because you know you need to recharge for another night shift. But your body seem to disobey your commands. It remains awake. So you wait until you and your body meet at a certain point where powerlessness settles in. You fall asleep instantly, but only for a short while. Soon you will wake up again at the sound of an alarm clock just when your body needs more sleep. So you wake up, mind and body asleep, with only your consciousness guiding you to the present, letting you perform with the only energy that remains.
You have difficulty distinguishing dream from reality. Which is which?
And there it goes. You go out as the sun goes down, as you retreat when the sun goes up. You go to work when people go home. You might as well be waking up and sleeping in your own grave, for you are like a lost soul wandering in a world of the living.
Sleep, a deprivation. End result, depression.