Baseline characteristics.

<p>Mann Whitney U tests were performed; all data are expressed as means±SD.</p

Body composition and resting energy expenditure (measured by BIA and indirect calorimetry, respectively).

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

Visceral and subcutaneous adipose tissue volume, liver fat content, intramyocellular lipid content (MR spectroscopy) and insulin sensitivity (euglycaemic hyperinsulinaemic clamp).

<p>Mann Whitney U tests were performed; all data are expressed as means±SD.</p

Correlation of salivary cortisol, baseline characteristics, glucose and lipid metabolism as well as catecholamines; filled circles represent controls, filled triangles represent insomniacs; p values including all participants are presented.

<p>Correlation of salivary cortisol, baseline characteristics, glucose and lipid metabolism as well as catecholamines; filled circles represent controls, filled triangles represent insomniacs; p values including all participants are presented.</p

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

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

Parameters of sleep continuity and sleep architecture (polysomnographic study).

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

Midnight and morning salivary cortisol concentrations in insomniacs and controls.

<p>Midnight values were significantly higher in insomniacs than in controls (p = 0.02), whereas morning values did not differ significantly (p = 0.18).</p

Recruitment of participants.

<p>Recruitment of participants.</p