What is a 'Z-Score'. A Z-score is a numerical measurement of a value's relationship to the mean in a group of values. If a Z-score is 0, it represents the score is identical to the mean score. Z-scores may also be positive or negative, with a positive value indicating the score is above the mean and a negative score indicating it is below the mean.
The pineal gland, also known as the pineal body, is an important endocrine gland that produces the hormone melatonin. Melatonin plays a key role in the sleep/wake cycle and the bodyâs response to sunlight. The pineal gland is a small, pinecone-shaped mass of glandular tissue about 1/3 of an inch (8 mm) long.
Melatonin is a natural hormone that is produced at nighttime by the pineal gland in the brain to help soothe and relax the entire body, while also assisting with the sleep-wake cyclesâensuring the body and mind receive a healthy nightâs rest.elatonin is a natural hormone that is produced at nighttime by the pineal gland in the brain to help soothe and relax the entire body, while also assisting with the sleep-wake cyclesâensuring the body and mind receive a healthy nightâs rest.