Yeah, that's not a reference to them adding sleeping bags you can carry. The game actually has SLEEPING BAGS in it. They're the cheapest, easiest beds to build in a settlement. You can also find there here and there in NPC camp sites and settlements.
I haven't approached it, but while there are a lot of beds across the game world, they are not all easily accessible, or usable, and even then there's no system in place to track or locate them other than just locating them. Even the marker system on the map isn't designed for this as you can only leave one marker on the map at a time. So you couldn't even make a record of the beds you find. That's not including the issue that many of them are in areas filled with hostiles or high levels of radiation.
Here's the quote taken from your link there:
"A sleeping bag will save your game and may help save your life when you're desperate, but it will never allow for a full night's rest and the benefits that come with it."
Here's the info on the "Sleeping Bag" mentioned in the quote:
http://www.ign.com/wikis/fallout-4/Sleeping_Bag
I'm not trying to shoot down the idea of having a "bed roll" like Lonesome Road's. But the addition of that item has NOT been confirmed by Bethesda yet. It would make sense for them to add it, but they haven't said anything yet.
Ok, so how does that work?
I sleep in a bed to save, then I go somewhere and quicksave, then the game crashes, so I load that quicksave. Or after I quicksave, I go fight some super mutants and die. So I load that bedsave, then load that quicksave and I'm back to where I was right before I fought the mutants. How do you lock out quicksaves or have the game determine which saves I can load because I died. The real problem here is that Fallout 4 really isn't designed to recognize and do anything to a save or to the game as a result of your death. Because death in Fallout 4 just ends the game.
Exactly.