Open neutral bedroom outlets
Most likely the outlets are all wired together in a "daisy-chain" fashion, so an open neutral from one would affect all others farther downstream.  I'd recommend opening up the first outlet (or all of them, if you don't know which is which) and check if the neutral has come loose.  In particular, if these outlets are wired with so-called backstabs where the wire is only held in by a spring clip, that's a likely culprit.  When you re-wire, it's highly recommended to use the screws since they're much more reliable.