A scientific guide to sleep and sensory wellness, providing comprehensive protection for men's healthy growth.

Development and Sleep

Approximately one-third of a person's life is spent sleeping. Sleep is a process by which the body replenishes its energy reserves and accumulates resources; it is also a crucial time for accumulating growth materials during growth and development. After falling asleep, muscles relax, and the activity of organs such as the brain, liver, kidneys, and gastrointestinal tract is greatly reduced, with overall energy consumption only 1/10 to 1/4 of that during activity. However, the activity of the endocrine system is quite different. For example, growth hormone secretion is high during sleep, which is beneficial for protein synthesis and physical development; insulin secretion is high, causing glucose to be converted into glycogen for storage; adrenal activity decreases, and the body's catabolism also decreases.

The amount of sleep required varies with age, and even among people of the same age, the required sleep time differs. During the pre-pubertal period, a minimum of 9 hours of sleep is needed, and even in the later stages, a minimum of 8 hours is required. Feeling refreshed and energetic after waking up indicates sufficient sleep. Sleeping in a prone position is not advisable, as it can affect cardiopulmonary function and may lead to masturbation habits. Sleeping with your head covered is also not recommended, as this can cause chronic hypoxia and vivid dreams, resulting in dizziness and poor mental state upon waking. Avoid eating before bed, and refrain from strenuous exercise, watching or reading television programs or texts that easily cause emotional excitement. Emotional excitement can not only make it difficult to fall asleep but also cause vivid dreams. Additionally, washing your feet with warm water before bed can promote sleep and reduce nightmares.

Adolescent Eye Care

1. Myopia

Besides genetic factors, adolescent myopia is mainly caused by neglecting eye care and improper eye use.

To protect your eyes, you should:

① Sit upright when reading or studying. The height of the desk and chair should be appropriate. Do not slouch over the desk or read in bed. ① Ensure adequate lighting, but avoid reading under glaring lights or strong sunlight.

② Do not read while eating, walking, or traveling.

③ Take a short break every half hour to an hour of reading or writing. Look at distant scenery, close your eyes to rest, or do eye exercises. Eye exercises can relieve eye fatigue, prevent the occurrence and development of myopia, relax tense eye muscles, and improve blood circulation in the eyes. However, they must be performed accurately and consistently. If myopia is detected, glasses should be worn promptly to slow its progression.

Vitamin A helps boost immunity, protects vision, and has anti-cancer effects. It is found in carrots, fish and poultry liver, dairy products, almonds, and cantaloupe. It should be noted that excessive intake of vitamin A can be harmful.

Vitamin C is known as the "King of Vitamins." It can increase capillary density, reduce vascular permeability and fragility, accelerate blood clotting, stimulate hematopoietic function, enhance resistance to infection, and prevent tumors, cardiovascular diseases, and stroke. It is also beneficial to teeth, gums, and eyes. Green peppers, strawberries, oranges, lemons, and other fruits are rich in Vitamin C.

2. Trachoma

Trachoma is caused by Chlamydia. Symptoms of trachoma include itchy eyes, photophobia, wind sensitivity, and increased eye discharge. If you turn your eyelids inside out, you will see redness and congestion inside both the upper and lower eyelids, with white bumps of varying sizes on the congested mucous membrane.

Trachoma should be treated promptly. Generally, aureomycin eye ointment or chloramphenicol eye drops are used, 3-4 times daily. If trachoma has progressed to trichiasis or corneal ulceration, further examination and treatment at a hospital are necessary.

3. Color Blindness

Most color blindness cases are congenital, a hereditary color vision disorder. However, color blindness can also be caused by diseases of the optic nerve or retina, in which case it is acquired.

Currently, there is no effective treatment for color blindness. Color-blind individuals face limitations in industries requiring strong color perception, such as defense, chemical engineering, textiles, and fine arts.

Adolescent Dental Care

Dental caries (cavities) occur when tooth enamel is damaged. Initially, caries is limited to the surface enamel layer and is asymptomatic. As it progresses deeper, reaching the dentin layer, it forms a cavity. At this stage, exposure to acidic, sweet, cold, or hot stimuli will cause slight pain. If left untreated, the caries continues to develop, further damaging the outer hard tissues and potentially reaching the pulp. If bacteria attack the pulp, it becomes inflamed, causing severe toothache. There are many causes of tooth decay, mainly including diet, nutrition, overall health, oral hygiene, brushing methods, and habits. In addition, a weak constitution, frequent illnesses, and nutritional deficiencies, especially in calcium, phosphorus, fluoride, and vitamins, are also contributing factors. Therefore, teenagers should have regular dental checkups, and any cavities discovered should be treated promptly.