Highlighting the importance of sleep has become evident in recent times. Since maintaining proper sleep hygiene is important for a human being to carry out all activities normally. But what happens when the effects on our sleep do not depend on the measures that we as humans can take, what happens when pathologies are what cause a sleep disorder?

On this occasion, we are going to deal with a quite interesting case when a tumour of the pineal gland causes a sleep disorder.

The pineal gland

The pineal gland is a small organ part of the endocrine system located in the centre of the brain, in the region known as the pineal recess or epiphysis, with a pine cone shape and measuring about 0.8 cm long. In an adult, it tends to weigh 0.1 grams.¹ The importance of the pineal gland lies in its vital functions, being able to mention the function of receiving and transmitting information about the state of environmental light-dark cycles through the cyclic production and release of melatonin at night.²

It is of utmost importance to know what a cardiac cycle is. We can define a circadian cycle as all those physical, mental and also behavioral changes that an organism undergoes in a 24-hour cycle.³ In simpler terms, it's the body's internal clock. The term circadian comes from the Latin "circa diem," which means "about a day".⁴

Among the functions of the circadian cycle, we can highlight its help in regulating sleep and wakefulness, metabolism, the body's reaction to stress, the body's core temperature, the immune system, hormones, and cognitive function.⁵

How does the circadian cycle work?

The circadian cycle tends to work as follows; as the amount of light available in our environment decreases, there is an increase in body temperature. In addition, the hormone melatonin, which is produced by the aforementioned pineal gland, begins to be released. So, at that moment we are going to start feeling sleepy and we are going to be sleepy all night.

Early in the morning when we expose ourselves to light, the levels of endogenous melatonin will decrease. Then, there will be a higher level of alertness, that’s when we are going to wake up and vigilance begins. Early in the afternoon; it tends to happen after we eat, there is another small elevation of body temperature and also of melatonin levels. Hence the desire to take a nap.⁶

What is a sleep disorder?

The Circadian Cycle is regulated based on environmental signals. Which is called "zeitgebers", a name that comes from German and means "timekeepers". Light and darkness are the most important Zeitgebers, but we can also mention others such as stress, social interaction, daily routines, exercise, and food. These are elements that will trigger the release of hormones by the brain. In this way, various chemical signals are executed in the tissues of our body.⁵

When the effect of these or other signals is altered, we can have a sleep disorder. These can be due to internal causes such as brain injuries or insensitivity to the night/day cycle. Likewise, the causes can also be external, such as abrupt time changes, irregular sleeping and waking hours, staying in bed for too long, lack of sunlight for a long time, and taking medications or substances.⁷

What is a tumour and what is a tumour of the pineal gland?

One of those mentioned internal causes can be the appearance of a tumour in the pineal gland. According to the Cleveland Clinic, a tumour is "a solid mass of tissue that forms when abnormal cells group together. Tumours can affect bones, skin, tissue, organs and glands.".⁸

Tumours of the pineal gland can be of different types:

• Grade I (pineocytoma): low-grade tumour (slow-growing)
• Grade II or III (parenchymal, papillary of the pineal region): intermediate-grade tumours; higher likelihood of reappearing after removal
• Grade IV (pineoblastoma): malignant -cancerous- tumour, grows quickly and tends to invade tissue

The symptoms of tumours in the area of the pineal gland depend on where the tumour is located. If it is in a position that blocks the normal flow of the fluid that surrounds the brain and spinal cord, called cerebrospinal fluid (CSF), it can cause an increase in pressure inside the skull, leading to a problem called hydrocephalus. The signs of hydrocephalus include headaches, nausea, vomiting, difficulty moving the eyes, balance problems, and difficulty walking.⁹

How to diagnose?

The diagnosis is made by combining:

• Medical history
• Physical examination

Medical imaging such as Magnetic Resonance Imaging (MRI), enables a medical study to be performed with a machine that uses an electromagnetic field(like magnets) and computer-generated radio waves to obtain images of the organs, computed tomography (CT) is another study that uses X-rays and computing to obtain detailed images of the organs, cerebrospinal fluid analysis and biopsy (obtaining a tissue sample to be analysed).¹⁰

What treatments can be chosen?

Depending on the type of tumour, the available treatments are surgery, radiotherapy, chemotherapy, targeted therapy, and if the tumour cannot be cured, palliative care.¹⁰

Medical literature records cases of tumours in conditions as delicate as pregnancy, fortunately, these cases are not so frequent, and the symptoms presented are the result of compression and direct invasion. To treat cases as delicate as these, it is recommended that surgery be performed in the second trimester and that chemotherapy be proceeded with after 14 weeks of gestation.¹¹

A good example of the effect that tumours of the pineal gland have on people's sleep quality is the case of a girl who had to have her pineal gland removed because of a tumour she had. As a result of this, the amount of melatonin secreted at night decreased. For more than 4 and a half years, this girl has received melatonin orally and this has greatly improved the quality of her sleep, and she has not had any adverse effects.¹²

Some studies have indicated that pinealectomy itself has not caused sleep problems, but cranial surgery in general has.¹³

If you experience significant disruptions in your sleep pattern and suspect that you may have a sleep disorder, it is advisable to consult your doctor and initiate the appropriate evaluation.

FAQs

What is the pineal gland, and what is its importance?

The pineal gland is a small organ in the brain responsible for regulating the circadian rhythm through melatonin production, which influences sleep-wake patterns and other bodily functions.

What is the circadian rhythm, and how does it work?

The circadian rhythm refers to the body's internal clock, governing physical, mental, and behavioral changes over a 24-hour cycle. It operates based on environmental signals like light and darkness, with melatonin release promoting sleepiness at night and wakefulness during the day.

How can pineal tumours affect sleep?

Pineal tumours can disrupt the normal function of the pineal gland, leading to symptoms such as hydrocephalus, which increases pressure inside the skull and causes sleep disturbances.

How are pineal tumours diagnosed and treated?

Diagnosis involves medical history, physical examination, imaging tests like MRI or CT scans, and sometimes biopsy. Treatment options include surgery, radiotherapy, chemotherapy, and targeted therapy, depending on the tumour type and severity.

Are there any real-life examples of pineal tumours affecting sleep?

Yes, the article mentions a case study where a girl with a pineal tumour experienced improved sleep quality after receiving melatonin orally.

Can cranial surgery cause sleep problems?

Research suggests that while pinealectomy itself may not cause sleep problems, cranial surgery in general may lead to sleep disturbances.

What should I do if I experience sleep disruptions?

If you experience significant disruptions in your sleep pattern, it is advisable to consult a doctor for evaluation and appropriate management.

Summary

In essence, our exploration of pineal tumours and sleep disorders has illuminated the critical necessity of upholding healthy sleep habits for overall well-being. We've delved deep into the intricate ways these tumours can disrupt our body's innate sleep patterns, posing formidable obstacles to attaining restorative sleep.

By increasing the awareness of various pineal tumour types, their distinctive symptoms, and the array of available treatments emerges as pivotal in effectively addressing these conditions. Through real-life anecdotes and compelling research insights, we've magnified the impact pineal tumours can exert on sleep quality, thus accentuating the urgency of promptly addressing any sleep disturbances through medical intervention.

As we conclude, this article stands as an indispensable roadmap, guiding individuals through the labyrinth of pineal tumours and sleep disorders, emboldening them to assertively champion their sleep health and overall wellness.