The problem is you won't be able to enjoy it for much longer if you do that.
My mom always forgets to put the TV in sleep mode and it stays on all night. This pretty much happened for 10 straight years now. In the past 2 years the tube has been going down. Focus and convergence are off, you need to turn the contrast low to get readable text. I have recalibrated it on a crosshatch pattern but there isn't much that can be done, the blue lines are always wider than the red and green. This is a clear indication of a bad tube. Lately some protection also started to kick in, making the whole picture go blank, then back on, then blank again... and this continued till someone would get annoyed and turn the damn thing off. I managed to fool that protection, but i don't know how much longer it will last. The TV is a 24" Samsung btw, and it's a piece of crap. Based on what's inside, i can hardly believe it made it this long (and it's had issues from day one, such as the picture bending on high contrast, and very large picture size differences between light and dark, due to the undersized power supply). But back then i was a kid, it's my dad who bought it. If it works for one more year i'll be happy.
The problem is that i want to replace it with a big plasma, coz they've gotten so cheap now, with LED screens flooding the markets. But my mom said a bigger screen would give her a headache. And i don't want to buy a supermarket brand CRT which is all you can find nowadays. The Samsung is a piece of crap, but at least it's a piece of crap that is on its 10th year of working 12+ hours a day.
PS. You'll also likely to get board issues before the tube ages. Last year the Samsung also had a capacitor failure.