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Syncope, also known as fainting, is defined as a short loss of consciousness and muscle strength, characterized by a fast onset, short duration, and spontaneous recovery.

It is due to a decrease in blood flow to the entire brain usually from low blood pressure.

Some causes have prodromal symptoms before the loss of consciousness occurs.

These symptoms may include lightheadedness, sweating, pale skin, blurred vision, nausea, vomiting, and feeling warm, among others.

Syncope may also be associated with a short episode of muscle twitching.

If a person does not completely lose consciousness and muscle strength it is referred to as presyncope.

It is recommended that presyncope be treated the same as syncope.

Sleep is a naturally recurring state of mind and body characterized by altered consciousness, relatively inhibited sensory activity, inhibition of nearly all voluntary muscles, and reduced interactions with surroundings.

It is distinguished from wakefulness by a decreased ability to react to stimuli, but is more easily reversed than the state of being comatose.

Sleep occurs in repeating periods, in which the body alternates between two highly distinct modes known as non-REM and REM sleep.

Although REM stands for "rapid eye movement", sleep affects other brain-body functions, including virtual paralysis of the body.

The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals.

The brain is located in the head, usually close to the sensory organs for senses such as vision.

The brain is the most complex organ in a vertebrate's body.

In a human, the cerebral cortex contains approximately 15–33 billion neurons, each connected by synapses to several thousand other neurons.

These neurons communicate with one another by means of long protoplasmic fibers called axons, which carry trains of signal pulses called action potentials to distant parts of the brain or body targeting specific recipient cells.