It's disappointing to hear about your sleep problems.
I've not had any Sleep/Hibernate problems since June 20th. I've been away from my office using my messenger bag with no overheating problems. Sleep/Hibernate have worked as they should. When in the office sleep has worked for days at a time when connected to the power adapter.
So far I've experienced 18 consecutive days of normal Sleep/Hibernate.
I've recently done a complete factory reset (before June 20th updates), so I should have a clean OS.
I've not changed any of the Power defaults since the factory reset.