How thin are the walls at your place?
We both had our doors open, I was leaving mine open to let the heat out (I'm not opening a fucking window with all these moths around) and he always sleeps with his door open. That's actually what really scares me, the idea of him having an actual heart attack and me being asleep or being down stairs and not hearing it.
Honestly dad isn't that old and he's shown no real signs of being at risk of a heart attack, but the family is in such a fragile state right now I really don't think this family could survive a day without him.
I really need to sit down with him and tell him how I feel about his lifestyle choices, he's put on a bunch of weight suddenly and I can tell he's super stressed.