5 question about using ear plugs

Today four basic types of hearing protection.

1. The most common are the disposable foam earplugs. These earplugs are comfortable, but they do not offer the maximum protection in noisy conditions. They fit multiple ear canals and can be disposed of after use.
2. Reusable earplugs - these plugs are pre-formed for the ear canal, washable, and made for multiple uses. They are as effective as the foam earplug but can be used multiple times.
3. Earmuffs - Earmuffs go completely over the ears. they fit everyone; one major downside is that they usually have a lower rating because they do not seal the ear canal. 
4. Custom Earplugs - Custom earplugs are molded to fit your ears exactly. They are designed to provide effective protection for different situations, such as swimming, hunting, or in the workplace. These type of earplugs can last several years. Because they are made using a mold of your specific ear canal, they create a perfect seal to prevent noise or water damage. These require the assistance of a hearing care professional to make an impression of your ear canal.

Noise induced hearing loss is the only preventable type of hearing loss. Once you lose your hearing from exposure to loud sound, your hearing will not recover. The best tip for earplug usage is to always wear them when you are going to be exposed to loud noise. This can be in the workplace, outdoor activities such as lawn mowing, use of power tools or going to concerts. 

Earplugs are generally safe to use while sleeping.  It is possible that after extended use it could lead to wax build-up or possible external ear irritation. Earplugs can significantly reduce the amount of sound entering the ears, which may help people get to sleep in noisy environments. When compared with other methods of inducing sleep such as sleeping pills, earplugs have fewer side effects.