Uller
Adventurer
Publishing an adventure without reference to key mechanics (and, sorry [MENTION=6780961]Yunru[/MENTION], gravity is not a mechanic) that must have been considered during the design of the adventure is puzzling IMHO - why should the DM have to reverse engineer it at the table?
Lost mines had a room in wave echo cave that is called out to the DM as a safe place to rest. I remember a couple places in the various temples in PotA that were called out. Some adventures do it. Some don't. Imxp, it is on the players to decide when their PCs can rest and the DM adjudicates the consequences of that choice. It is helpful for an adventure to point out places that the designers intended to be rest places. But the DM has a role here.
I don't think it is intended for long rests to occur in Ravenloft. I am allowing my group to do it (I just roll random encounters normally) until they encounter Strahd. Then he becomes "active" and will hunt them. But they don't know that. As far as they know he is actively hunting them now.
Do yes...I think some guidance is warranted here in published adventures just like with the many "what do we do with all this loot?!?!" threads. But in the end it's the reason we have a DM...to figure out what the consequences of unscripted actions in the game are.