I used to sleep in my contacts, wear them for a few months, until I experinced a lens getting stuck to my eye. I didnt know it, but as I tried to remove it, it pulled my eyeball out. Not sure if it was 1/16" or an entire inch, but it felt way too wrong, and I immediately resolved to never sleep in them again. I change them out more often too now, usually 4-6wks. I throw out the oldones in when my solution runs out.
And damn, looking at everyone's prescriptions, you're making me feel like I'm wasting my money on contacts. I'm somewhere around 1.00/0.50. Been 'normal' until this year when I just got astigmatism in one eye, and doc said I should pick up 0.75 readers.