TABLE 1

Sleep in idiopathic pulmonary fibrosis

Sleep macro- and micro-architecture	Increased stage 1 sleep Decreased REM and slow-wave sleep Decreased sleep efficiency Increased WASO Increased arousal index
Respiratory pattern	Increased respiratory frequency during sleep Rapid and shallow breathing (especially during REM sleep)
Nocturnal oxygenation parameters	Episodic desaturation during REM sleep Desaturation during NREM sleep Desaturation due to respiratory events (apnoeas and hypopnoeas)
Sleep disordered breathing	Increased incidence of obstructive sleep apnoea
Other sleep problems	Increased periodic leg movements during sleep Insomnia Nocturnal cough