wearing mine for like, 3 months at a time for the past few years. Only problems I ever get are when Im tired and my eyes dry out or when I do stuff that makes my eyes all red and fuzzy... 
Now i shouldnt care, but dude... it is your eyes??
The Night and Day Lens worn over a month loses any benefit it has over the previous materials... as the lens gets older the amount of oxygen that flows through it also goes down. Essentially you are wearing old style lenses overnight for the last few months. This also increases your chance of infection. Keep it up and you will have so many issues health wise that you wont be able to wear lenses in the future...
want your eyeball to look like this????
