Safe to leave laptop on all night?

If your electricity bill isn't an issue, then no.

no

No, it isn't bad. Many people leave their computers on 24/7. It isn't a big deal.

It might be bad but i doubt it ive done it before and nothing has happened to my laptop, NOT MY FAULT IF YOUR LAPTOP GETS FUCKED UP.

Not really unless it's prone to overheating or is in an unsafe area. (ie. kids, odd surface, next to heater, not on a surge protector, etc.)

Deepens on how much your Laptop heat is; I got a huge fan under my Asus G53 so the Temp normally is 40 C and in games max 80 C
download a app that checks the Temperature just in case if its over 100 Not good to leave it on in my opinion since i got a laptop......

bad for your energy bill mostly

not bad at all, just leave it on the table so airflow is ok (my wife leaves it for month without shutting it down)

just make sure it doesn't overheat, if you have a good fan then it's fine

Should be fine. I do it most of the time~

As long as you leave it in a well ventilated place it should be fine, I know laptops can heat up very quickly so just be careful

I don't have a laptop running windows, but I leave my macbook on all night and it's fine.

Just find a way to keep it cool. Then it's safe.

My laptop works 24/7 for 4 years already. Had to change a hard drive probably because of natural wear, but otherwise it's fine. I just disassemble it twice a year to clean its insides and change the thermal grease.

My laptop is on 24/7 and usually for 1-2 weeks before I even restart it.

You can turn the setting to turn off the monitor when you close the lid. That won't interrupt a download and save power. You only want to avoid it sleeping or hibernating. Of course, make sure to leave the adapter plugged in and leave it in a well ventilated spot where it won't be stepped on or knocked over or anything.

Unless your laptop is prone to overheating, leaving it on for the night probably won't cause any problems.

Make sure to have it plugged in to an outlet. The battery would most likely go dead overnight otherwise.

Nope, just remove your battery, if you dont do this very often there should be no problem, even with the battery. I do this all the times, because desktops consumes way much more electricity. >>>> Alsooo You should never forget to restart your pc if you have any updates on going, last time I was about download about 30gb so I went to sleep, next day I find that my PC has been restarted by the Windows Update Software, and it just download like 1gb. I get really mad that day.

on a similar note, is it good to let my battery run out ovenight

imho, i wouldn't close it (screens can get hot, and compound that with the heat of the rest of the laptop, and then closing it, insulating the inside leaving even less room for the heat to escape -- it might do bad things -- it's a guess I have as to why part of my old laptop's screen has a thumbprint-sized spot on it that's a little darker than the rest of the screen).

also, to make sure the download doesn't get interrupted, make sure it isn't set to go into sleep mode -- having it go to a screen saver or turning the screen off should be fine though.

Sure. But if it is an old laptop, don't close it, make sure there is nothing under it or behind it. It can get hot. Otherwise go for it. I keep both my PC and laptop on at night often.

do not close the lid, it may cause over heating.

I haven't turned my laptop off for a few weeks and it runs great. (I restart it occasionally just like I would a desktop)

Just make sure it doesn't go into hibernation and you'll be fine.