Congenital and childhood myotonic dystrophy: Current aspects of disease and future directions

Table 3 Sleep disorders in myotonic dystrophy type 1 that contribute to hypersomnolence

Sleep disorder	Description and components
Excessive daytime sleepiness	Greater susceptibility to falling asleep, especially when in situations requiring less attention
	Naps are long, frequent and unrefreshing
Long night time sleep	Sleep often does not feel sufficient or restorative
	Sleep fragmentation and frequent arousals
Sleep related breathing disorders	Sleep apnoea or hypopnoea: Obstructive and/or central
	Hypercapnoea and hypoxemia in both day and night time
RLS and PLM	RLS refers to the urge to move limbs while both awake and asleep, while PLM refers to uncontrolled limb movements during sleep. Both commonly co-exist
REM sleep dysregulation	Abnormal periods of SOREMPs during MSLTs
	Increased density and frequency of REM sleep nocturnally

RLS: Restless leg syndrome; PLM: Periodic limb movements; SOREMPs: Sleep-onset REM periods; MSLTs: Multiple sleep latency tests; REM: Rapid eye movement.