I'm about to run The Sellswords of Punjar by Goodman Games - the PCs will enter Cutpurse Alley (my version shown here:)
The introductory text says:
Here, crossbowmen can make attacks from second-story windows, assassins appear from any shadow, and no area is safe to rest unless every entrance is guarded and warded. Once alerted, the defenders will not passively sit by, waiting for the heroes to attack at their leisure. Rather, the beggars will launch repeated assaults on the heroes in an effort to wear them down, denying PCs the chance of an extended rest. [emphasis mine]
This is an assault on a lair: There are going to be up to 22 encounters and, as written, it is entirely possible that they won't be able to take more than one or two rules-as-written extended rests without stretching the fiction till it breaks. Besides, I like the idea of having to press on quickly to build the tension - but that's going to result in a TPK somewhere around the 4th or 5th encounter.
Since extended rests are required to recharge daily powers and recover surges, they are critical to get through this much content.
What techniques have you seen used to restore personal daily powers and healing surges that don't require 6 hours of uninterrupted rest?
Though the party at present is a Rogue, Bard, Paladin, and an Artificer (who can at least recharge an item daily power), solutions that work for all groups are welcome.