Table 3.

Sleep in older age. Summary of all the studies that use polysomnography.

Authors	Group	N°	Age (SD)	(%F)	MMSE (SD)	Measurements	Results
Curcio et al. [45]	HS	10	68.6 (7.0)	50	26.7 (1.3)	PSG	L NREM1(min): 18.0 (4.4) L NREM2(min): 21.1 (16.4) L SWS (min): 81.9 (6.5) L REM (min): 146.7 (32.1) NREM1 (%): 12.6 (2.3) NREM2 (%): 69.9 (2.0) SWS (%): 0.4 (0.2) REM (%): 17.0 (1.6) Awakenings (n): 25.0 (2.5) TST (min): 347.5 (22.3) TBT (min): 532.9 (171.7) SE (%): 70.8 (6.4)
Prinz et al. [57]	HS	22	69.0 (6.4)	50	29.6	PSG	TIB: 456.3 (37.7) NREM 3–4 (%TIB): 8.9 (5.2) REM (%TIB): 16.8 (4.1) W (%TIB): 21 (7.2) Awakenings (n°): 13.6 (4.7) LREM: 65 (24.7)
Reynolds III et al. [58]	HS	25	69.0 (5.0)	68	29.2 (0.9)	PSG	SL (min): 22.2 (16.9) W (min): 47.4 (32.8) TSA (min): 368.7 (44.5) Arousal (n): 6.8 (2.7) SE (%): 84.1 (8.3) Sleep maintenance (%): 88.6 (7.3) NREM1(%): 9.7 (8.2) NREM2(%): 64.9 (8.3) Stage N (%): 2.6 (6.2) NREM3–4(%): 2.5 (3.9) REM (%): 20.2 (4.9) LREM: 57.6 (16.9) REM time (min): 75.0 (21.2)

SD = standard deviation; F = female; HS = healthy subject; MMSE = Mini Mental State Examination; PSG = polysomnography; TST = total sleep time; TSA = time spent asleep; TIB = time in bed; TBT = total bed time; SL = sleep latency; SE = sleep efficiency; LNREM = nonREM latency; NREM = nonREM; LREM = REM latency; REM = rapid eye movement; LSWS = slow-wave sleep latency; SWS = sleep wave sleep; WASO = wake after sleep onset; W = wakefulness.