Okay tried that, when you sleep you only recover a small amount of health and can only do it once. Contrary to what that article says.
Also, I've always explored in the game. I've tried collecting resin to increase my health bar too. No success. I haven't even got to the first boss in the game since my first few goes at it. I can't understand how that'd be the case. I'm certain the game gets harder the more you play, which is frigging ridiculous for someone that found it hard to begin with. The balance of this game is completely off for me.
I'm honestly bored of trying and moaning about this game. I've deleted it.
Just fair warning to anyone that's thinking of getting it, I find it impossibly hard, you may too. I'm surprised every reviewer got on with the difficulty of it.