You certainly won't die or have a heart attack. Why would you? Your heart always beats even when your sleeping. I went 10 months on very little sleep and never experienced any medical issues. In fact I went to 4 different ERs in 4 different cities over a 4 week period and they all said there was nothing wrong with me. I had every medical test that insurance would allow including brain and body MRIs, complete blood work, etc.
Everything came back normal. I was certain that my lack of sleep would cause some sort of medical issue, but it didn't and it didn't for many others on forum too. Your body will get all the sleep it needs before something bad will happen to you. "microsleeps" sustain you.
Sure, it's always better to sleep, but 3 hours isn't bad. There were many times when I thought 3 hours of sleep was great.
Unfortunately updosing at this point probably isn't going to give you more sleep? Please be grateful for the sleep you are getting.
Your sleep may become worse up and until you are completely off, but then true healing and recovery will begin.
It may not be easy but, you can do this. I did it and so did countless others. It's temporary, it won't last forever. Sleep Returns given enough time.
Good luck
