Dear Light Sleeper
Yes, the constant pressure on your ear can do harm to your outer ear cartilage. The shape could change with constant exposure to pressure over time. There are several comfortable earplugs that you can use, the same soft ones that are sometimes used for hearing protection against noise are comfortable enough to sleep with.
I would also advise you to see your general practitioner, just to make sure that there is no medical reason for the light sleep. Also remember to keep our stress levels low and your body and mind, healthy and fit. You could also make a few adjusments to your environment to make the noise levels more comfortable for you.
Please let me know if you need any further information
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