There are also zones later in the acts where they disable resting - this really impacts spell casters. You have to really ration your ability usage (rely on consumables for healing etc), somewhat annoyingly you have no real way of knowing how far through the no-rest zones you are (could be 4 or 5 fights in a row you need to get through or only 1 or 2). I'd often end these zones with big spells still in reserve cleric in particular with turn undead would have helped immensely in one area but I thought there would be another fight still to come so I saved it. This is somewhat true to tabletop D&D but left me feeling a little frustrated I think on repeated playthroughs these areas will be much less frustrating.