1Departments of Biostatistics, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India
Departments of Neurology, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India
*Address for correspondence: Dr Sanjib Sinha, Additional Professor, Department of Neurology, NIMHANS, Hosur Road, Bangalore 560029, Karnataka, India. Ph: +91-8026995150, Fax: +91-8026564830, Email: sanjib_sinha2004@yahoo.co.in
Online published on 19 December, 2013.
Focussed studies about association between arousals and phasic sleep events are few. We analyzed the association between arousals and sleep events during slow wave (N3) & REM (R).
Overnight PSG recording of 30 healthy adults were analyzed using AASM manual (2007). Occurrence of various sleep events and arousals were analyzed.
There were 405 arousals, only 45 were de novo. In N3, sleep events associated with arousals included PLM-110 (88.7%); sleep spindles-48 (38.7%); desaturation-4 (3.2%); snore-13 (10.5%); and apnea-3 (2.4%). During R, sleep events associated with arousals included PLM- 203 (72.2%); rapid eye movement-99 (35.2%); snore-53 (18.9%); desaturation 2 (0.7%); and apnea-12 (4.3%). Number of arousals in N3 and R that occurred de novo, and with single and multiple events were: a) N3-de novo 9 (7.3%); single event-61 (49.2%) and multiple events-54 (43.5%); b) REM: de novo-36 (12.8%); single event-132 (47.0%) and multiple event-113 (40.2%).
Majority of arousals (88.9%) in normal individuals are associated with phasic sleep events. Such studies might unravel the understanding of arousals in sleep and its mechanism.
Arousals, N3, REM, phasic sleep event
