Inability to shut off the brain.
Failure to tone down or turn off the noise in your head.

Sleeplessness that results from thoughts that are captured in a continuous segue, e.g., the wikipedia snowball effect.

Insomnia nights can make your brain physically hurt the next day.

JJ's Definition of insomnia: My brain in wikipedia mode.

Couldn't sleep again last night....Couldn't shut off my brain.

Insomnia: I took the red pill last night.
by Turn Yourself Around August 29, 2008
The inability to sleep, because your body and the universe teamed up and decided to hate you.
Tess: I can never get to sleep! Argh, this insomnia is driving me crazy.
Elle: Have you tried warm milk? Ooh, or turning your pillow over? Because that always helps me.
Tess: you KNOW the meaning of insomnia?
by SleeplessInMelbourne December 08, 2010
Inabillity to sleep when it is appropriate.
Prolonged lack of sleep causing physical symptoms.
Did you ever hear about the dyslexic agnostic insomniac?
He would lay awake all night wondering if there realy was a Dog!
by Or am I the Dog January 09, 2004
Insomnia is a sleeping disorder. There are various different types of insomnia, depending on a number of factors.

Transitory insomnia affects an individual for only a few nights. Short term insomnia may last several days or a couple weeks. Chronic insomnia lasts several weeks or even months.

Insomnia may affect different parts of the sleep cycle. A person with insomnia may have little trouble falling asleep, but find that they wake up after only a few hours and cannot fall back asleep for several more, if at all. A person may also have immense difficulty falling asleep, only to find that they can't stay asleep for any meaningful length of time.

Having a sleep cycle longer or shorter than 24 hours does not necessarily constitute insomnia, however it may be a sign of another sleeping disorder, and should not be ignored. Staying up late and sleeping in is not insomnia either, as insomnia constitutes an inability to get enough sleep, and not an inability (or unwillingness) to get to sleep at the right time. Many people believe that they have insomnia, or claim to have insomnia, who actually only have one of the above problems.
The author of this definition fell asleep at about 8:30 PM last night, and woke up at about 12:00 AM. It is now about 7:00 AM, and he has still not been able to return to sleep, despite attempts to sedate himself repeatedly with milk, music, and masturbation. This difficulty has persisted in a like manner for several weeks. It is likely that he suffers from some form of insomnia.
by Five Six Five November 14, 2009
When you have trouble sleeping with or without reason and can cause unusual late night activity... Like writing the definition of 'insomnia' on UD
fucking insomnia won't let me sleep. WHAT THE FUCK IS WRONG WITH MY BRAIN?!!
by anonymousfucker April 04, 2010
1. A disorder that prevents someone from getting enough sleep

2. A self diagnosed ailment that all attention whores suffer from.
Carl: I went for a checkup today. The doctor said I might be suffering from insomnia.
Joe: Shit son.


Lisa: trying 2 sleep but its hard with insomnia lolz
Jim: Bitch, shut the fuck up.
by BilboFaggins December 31, 2009
A common health problem characterised by difficulty in either falling or staying asleep. It can occur on its own (primary) or as a result of another medical disorder, such as depression (secondary).
Insomnia can be debilitating.
by Doc_B April 16, 2015
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