Just don't do that. I used to do that just fine and that's why I thought I was OK. I mean, I USED to go on in huge coding benders, did'nt I ? Well apparently not at 55, when the pressure has been on for months instead of weeks.
Other things to watch -- diet! With the work came less free time, put on weight etc and all the good habits I had built for years, disappeared.
And the worst bit you can think of is "Oh but I'm so CLOSE to being done, I'll just fix it up later when I can relax". Just don't.
I lost all sensation on the right side. It is coming back slowly. I can still work, didn't lose speech or mobility or strength, I consider myself super-mega-lucky in that.