aaaaaaaaaa ^[22] – n. (usually plural) noise made by a sleeping person who can not wake from a nightmare:

Waking up to his wife’s  aaaaaaaaaa^[22] was far worse than being trapped in his own nightmares. Even their aaaaaa ^[7] was overwhelmed by her nightly attempts to soothe her mom by aaaaaaaaa ^[108]ing. Only after a pyschopharmacologist prescribed medication to eradicate her PTSD dreams, did he realize how much all their family relationships had been suffering from the weight of sleep deprivation.