Adds wear to the stylus, carves out the lead-out groove, but shouldn't really do any significant damage if you catch it relatively early.
Letting it run like that for overnight, on a regular basis will cause the cartridge to wear out much faster, and it will have alot of "gunk" on it from carving the lead-out groove all up. Definitely clean the stylus well after it happens.
I highly recommend an "end of record tonearm lift", such as the Expressimo "Lifter", or something like it. Not much money, and gives you more peace of mind if you tend to fall asleep when listening.
Letting it run like that for overnight, on a regular basis will cause the cartridge to wear out much faster, and it will have alot of "gunk" on it from carving the lead-out groove all up. Definitely clean the stylus well after it happens.
I highly recommend an "end of record tonearm lift", such as the Expressimo "Lifter", or something like it. Not much money, and gives you more peace of mind if you tend to fall asleep when listening.