LensShopper - Contact lens price comparison
Yes you can assuming that you are wearing the right kind of lenses which are tested and in working order as stipulated. To fall into slumber in front of the television for a half an hour does not represent any threat worth mentioning, regardless of which lense type you may be using although it may feel a little dry or uncomfortable in the eye as a result when one wakes up, but this passes after a few, short minutes.