Table 3. Salivary cortisol, urinary catecholamines and dopamine, and plasma metanephrines and 12-hour excretion rates of urinary metanephrines.

	Insomniacs	Controls	p-Value
Salivary cortisol 11:30 p.m. (nmol/l)*	1.4 ±1.4	0.7 ±0.4	0.02
Salivary cortisol 6:00 a.m. (nmol/l)	10.3 ±6.3	7.3 ±3.5	0.18
Urinary adrenaline excretion rate (nmol/12 h)	9.9±11.1	15.5 ±18.1	0.06
Urinary noradrenaline excretion rate (nmol/12 h)*	9.5±23.8	16.0 ±43.4	0.02
Urinary dopamine 12 h excretion rate (nmol/12 h)	13.6±215.2	12.2±294.8	0.64
Plasma normetanephrine (nmol/l)	0.2 ±0.0	0.3 ±0.0	0.15
Plasma metanephrine (nmol/l)	0.1 ±0.0	0.1 ±0.0	0.91

Mann Whitney U tests were performed; all data are expressed as means±SD; *indicates statistical significance.