Table 1.

Common sleep disturbances in neurodevelopmental disorders

Neurodevelopmental disorder	Sleep disturbances
	Sleep-onset insomnia	Sleep maintenance insomnia	Sleep disordered breathing	Excessive daytime sleepiness	Nocturnal seizures
Angelman syndrome	+++	++			++
Autism	++	+			+
Down syndrome		+	+++	++
Fragile X syndrome	+++	+++	+
Prader–Willi syndrome			+++	+++
Rett syndrome	++	++	++
Smith–Magenis syndrome	+++	+++	+	+++
Williams syndrome	+++	++		+