I think 4lb is about 1kg.
Working 13 hours won’t cause a heart attack.
A defective heart causes a heart attack.
Have you had a diagnosed heart attack? And what type? And do you have ongoing treatment?
My opinion, not that you asked… Try not to get too twisted over sleep. The more you worry about it the more pressure you feel about not having enough, and not being able to sleep. Worst case scenario from a lack of sleep is tiredness. It’s not like insomnia will give you leukaemia. Even just laying and relaxing your body will heal.
The more you obsess over it, the harder it is too achieve. Have you tried a routine? Your brain adopts your habits good and bad. If you constantly feed it “I can’t sleep… I CANT SLEEP!” Your brain will respond with, “oh no sleep, I got you. Stick with these brainwaves and I’ll ensure you never sleep again mwhahahahaha”
Create the opportunity. And buoy, it’s totally okay to complain.