by 
The Curious Bag
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<h4 class="dechead">On One Hand: Extended-Wear Contacts Are Made for Sleeping
The biggest risk associated with sleeping in your contacts is a restriction of the oxygen flow to your cornea. Daily wear contacts are not meant to be worn overnight, because they do not allow oxygen to permeate the lens. Extended wear contact lenses are made of a special material that is highly permeable to oxygen. Lenses made from this material are approved for continual around-the-clock wear, some up to 30 days.
On the Other: Some Risks Still Exist
Irritation and infection risks are increased by sleeping in your contacts, because they are not cleaned and disinfected every night. Swimming and exposure to smoke increase the risks of complications. Follow your eye care professional's instructions for lens care and replacement.
Bottom Line
If you sleep in your extended wear lenses, check your eyes for redness and irritation daily, and remove your contacts at the first sign to prevent a more severe problem. Extended wear contact lenses are considered safe to wear while sleeping, for a week or up to a month at a time.
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