Side Effects Of Headphones

During the past decade, the damaging effects of excessive noise pollution from portable stereo earphones have gained attention. If you can hear the sound being delivered into a person's ear via headphones or earphones, it indicates the sound is too loud and over an extended
period can lead to permanent hearing loss.
Headphones that go over your ears can also damage your hearing if you use them too long or play music too loudly. They're just not as much of a risk as earbuds are: Having the source of the sound in your ear canal can increase a sound's volume by 6 to 9 decibels — enough to cause some serious problems.

Hearing Loss and Headphones - Is Anyone Listening?
HOW LONG CAN YOU USE HEADPHONES
As a rule of thumb, you should only use MP3 devices at levels up to 60% of maximum volume for a total of 60 minutes a day," says Dr. Foy. "The louder the volume, the shorter your duration should be. At maximum volume, you should listen for only about five minutes a day."

Can earphones cause brain damage?

The chances are very dim, it won't damage your brain cells but sound louder than 85 dB can cause permanent damage to your hearing ability. Using earphones for too long can cause ear infection as well, try using the flat one and avoid sharing it with others (especially the one that goes deep into the ear).

What happens if you put on headphones for too long?

Headphones that go over your ears can also damage your hearing if you use them too long or play music too loudly. They're just not as much of a risk as earbuds are: Having the source of the sound in your ear canal can increase a sound's volume by 6 to 9 decibels — enough to cause some serious problems.
Is it bad to listen to music in your headphones when you fall asleep?
Listening to music via headphones while sleeping might be safe. It really depends on the volume. If you are listening to music that is just above your quietest hearing threshold, that should not cause a problem. Without being totally exhausted, most people probably couldn't fall asleep if the music was too loud.

*The link below entails what you should know