<p>I'm having a lot of issues leveling my printer and one failed print came out like this. Is there something wrong with the surface that I need a new bed? This happens to me quite often and I literally can't get it off.</p>
<p><a href="https://i.stack.imgur.com/vOVeZ.jpg" rel="nofollow noreferrer" title="Magnetic bed with filament still stuck to bed"><img src="https://i.stack.imgur.com/vOVeZ.jpg" alt="Magnetic bed with filament still stuck to bed" title="Magnetic bed with filament still stuck to bed" /></a></p>

Presuming that you're talking about an 8 hour period, your printer should be designed to run for 8 hours continuous anyway, so nothing will happen regarding the bed or screen that wouldn't happen with a normal print.
If the first few layers stick to the bed, it's likely that you're print will at least be partially completed. So even over night it won't be a full 8 hours of printing while failed. Maybe half that period.
If the problem is bed adhesion, or anything that doesn't effect the filament being supplied to the nozzle, then your only problem will be wasted filament and disposing of the spaghetti. No harm will come to your printer.
If the problem is a break in the filament or filament runout, or a blocked nozzle then you could have damage to the head of the nozzle from printing dry. If you're printing with PLA this isn't really something that you need to worry about too much as you can run a printer dry for several hours without any problems.
If you're printing with ABS or something that needs a hotter head then you could cause damage to it if it's allowed to run dry for an entire night. But again this isn't really something that you need to worry about unless it's running dry for 4 or 6 hours.
Simply checking in on it once in the night should be enough to prevent any problems.