Most of the foam body of the earplug should be within the ear canal. Try cupping your hands tightly over your ears. If sounds are much more muffled with your hands in place, the earplug may not be sealing properly.
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Make sure to insert the earplugs far enough into the ear canal to provide a proper seal. But be careful not to insert the earplugs too far, as this can cause discomfort or even injury.
Earplugs are generally safe to use while sleeping. However, over time, earplugs can push earwax deep into your ear canal, causing a build-up and leading to feelings of blockage, hearing loss and possible infections.
The length of time that it is safe to wear ear plugs depends on the type of earplugs being used, as well as the individual wearing them and the situation they are being used in. For disposable foam ear plugs that are commonly used to block out noise, it is generally safe to wear them for up to 8 hours at a time.