RS	Rett syndrome
SDB	sleep-disordered breathing
oPG	overnight home polygraphy
LRTIs	lower respiratory tract infections
MECP2	methyl-CoPG-binding protein 2
CDKL5	cyclin-dependent kinase-like 5
URTIs	upper respiratory tract infections
TST	total sleep time
AHI	apnea–hypopnea index
oAHI	obstructive apnea–hypopnea index
CAHI	central apnea–hypopnea index
ODI	oxygen desaturation index
T90	percentage of the TST spent with an SpO2 < 90%
OSA	obstructive sleep apnea
CSA	central sleep apnea
PtcCO2	transcutaneous carbon dioxide
SD	standard deviation
ACT	airway clearance technique
ET-IV	endotracheal intubation
HFNC	high-flow nasal cannula oxygen therapy
PEG	percutaneous endoscopic gastrostomy
PSG	polysomnography