Closing your eyes briefly for a short five-minute rest or nap while wearing standard daily soft contact lenses is generally harmless, but doing so regularly—especially with eyes fully shut—reduces vital oxygen transmission to the cornea. If you need to sleep or take an extended rest, optometrists strongly recommend removing your contacts to prevent corneal dryness, oxygen deprivation, and the increased risk of microbial irritation or bacterial adhesion beneath the lenses.