Table 1.

Participant characteristics and sleep measures. Sleep measures are shown in minutes except for sleep efficiency that is shown as %. SD standard deviation, BMI Body Mass Index, ISI Insomnia Severity Index, HADS Hospital Anxiety and Depression.

	Young	Older
n	38	34
Age, median (range)	23 (20–29)	68 (65–75)
Sex, n male, n female	17, 21	15, 19
BMI at first scanning (mean, SD)	22.6 (3.3)	24.7 (3.6)
Completed primary education (n)	0	3
Completed secondary education (n)	9	15
Currently enrolled in tertiary education (n)	25	1
Completed tertiary education (n)	4	15
ISI (mean, SD)	10.6 (2.1)	9.1 (1.5)
HADS-Depression (mean, SD)	1.1 (1.4)	1.1 (1)
Total sleep time (min), full sleep (mean, SD)	440.2 (75.1)	400.3 (62.3)
Total sleep time (min), partial sleep deprivation (mean, SD)	180 (23.9)	158.8 (32.5)
NREM (min), full sleep (mean, SD)	353 (58.7)	321.6 (61.6)
NREM (min), partial sleep deprivation (mean, SD)	154.5 (23.1)	132.8 (29.7)
N3 (min), full sleep (mean, SD)	102.9 (33.1)	44.6 (33.9)
N3 (min), partial sleep deprivation (mean, SD)	70.5 (16.7)	27.2 (24.8)
N2 (min), full sleep (mean, SD)	187.8 (50.8)	187.6 (45)
N2 (min), partial sleep deprivation (mean, SD)	65.6 (23)	72.8 (22.6)
N1 (min), full sleep (mean, SD)	62.3 (29.9)	89.5 (36.6)
N1 (min), partial sleep deprivation (mean, SD)	18.4 (9.7)	32.8 (13.6)
REM sleep (min), full sleep (mean, SD)	87.2 (30.4)	78.7 (35.)
REM sleep (min), partial sleep deprivation (mean, SD)	25.5 (12.2)	26 (18.8)
Sleep efficiency (%), full sleep (mean, SD)	93.6 (4.2)	85.8 (9.2)
Sleep efficiency (%), partial sleep deprivation (mean, SD)	94.7 (3.8)	85.7 (11.8)
Sleep latency (min), full sleep (mean, SD)	9 (8.4)	10.4 (10.1)
Sleep latency (min), partial sleep deprivation (mean, SD)	5.2 (4.4)	9.9 (15.6)
N3 latency (min), full sleep (mean, SD)	17.9 (7.3)	50.4 (65.5)
N3 latency (min), partial sleep deprivation (mean, SD)	13.2 (3.1)	33.9 (31.6)
REM latency (min), full sleep (mean, SD)	109.1 (46.1)	82.1 (40.4)
REM latency (min), partial sleep deprivation (mean, SD)	83.7 (34.5)	63.1 (32.3)