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The big tired where you can't do anything and you can't feel anything even though you have no particular reason not to

Lethargy is lying on the floor and thinking about nothing as five hundred trains if thought trundle aimlessly through your head before nosediving straight off a cliff
"Why not get out and get some vitamin D, even if you don't feel like it? Better than spending another Sunday afternoon in lethargy.

Seismic Lethargy 

An extreme state of lethargy, cause unknown, but very tiring. Seismic Lethargy can strike down its victim without warning and usually whilst they are trying to do something. It usually affects young males and reported cases are more prevalent in the warmer summer months. The consensual course remedy is to remove the patient from the environment that is inducing the lethargy.
Rhys is unable to continue today because he is suffering from Seismic Lethargy.
Seismic Lethargy by David Harding September 18, 2008

Post Lethargic Stress Disorder (PLSD) 

Similar to PTSD (Post Traumatic Stress Disorder), PLSD is a disorder that occurs when a human experiences a long period of lethargy (the person has done “nothing”) to then return to a stressful environment such as school or work. Usually accompanied by mild to dysfunctional depression and suicidal thoughts. Other known related symptoms are insomnia, tiredness, and emoness.
"After spring break, 203 people were diagnosed with Post Lethargic Stress Disorder (PLSD). Of these victims, 23 committed suicide the following Monday. The other 180 reported bouts of tiredness and a few reported cases of emoness.

'Yes, it is a growing concern, especially affecting people as young as 13 years old!' says Dr. Gibbons of the PLSD Research Facility of Orange County"

- The Washington Post

lethargism 

A term used to describe the religion that many college students follow on a daily morning basis. Lethargism stems from the word lethargic, or drowsy. The willingness to stay in bed and sleep overpowers logical reasoning such as; coming to class on time, finishing a paper, or study for a test. Similar to the illogical behavior of certain religious activists whose points have been dis-proven through the use of science. Lethargism is exercised by a vast majority of people unbeknownst to them.
Dan: Yo man wake up you gotta finish that essay.

Eugeen: Cant man I'm compelled to sleep.

Dan: Bro, lethargism is gonna ruin your life

Eugeen: Naw man it makes me do funny things in my head instead of facing reality.
lethargism by your mattress December 9, 2010

lethargic 

Msst fat people are lethargic
lethargic by Junkyardjimbo88 April 28, 2003

I would be more apathetic if I weren't so lethargic 

translation:

I would show more abscense of emotion, if i werent so tired
"I would be more apathetic if I weren't so lethargic"

*waits 2 days*

"OHHhhhhh i get it, thats kinda funny...
Yeah can i get a copy of Juggs?"