Only your eye care provider can determine whether or not you should sleep in your contact lenses. Every brand of contacts is different on its makeup and intended use, and Air Optix contacts are no different. Air Optix Night and Day are approved for extended wear, and can be slept in for thirty consecutive nights. That being said, all other Air Optix contacts are generally considered safe for occasional sleep: up to six nights on a 30 day contact.
It is important to note that even if you are approved to sleep in your contact lenses, pay attention to your eyes. If at any time your eyes feel pain, discomfort, or dryness, remove the contacts right away and consult your eye care provider.