Sleep structure parameters when given a choice between three air temperatures values.

<p>Mean ± SEM values for the different sleep stages in the control and the RF-EMF-exposed groups when given a choice between 24°C, 28°C and 31°C during light and dark periods and during 24 h periods. Amounts are in fact expressed as a percentage of the analysis time, which due to animal caring, is less than 24 h. Statistically significant differences between the control and exposed groups are indicated as follows: (*): p<0.05 and (**): p<0.01.</p

Thermal preference for controls (A) and RF-EMF exposed rats (B) over a 24 h period.

<p>The mean ± SEM time (in minutes, averaged over two-hour periods) spent in each of the three air temperatures zones (24°C (•), 28°C (□) and 31°C (▴), indicating the preferred temperature) during the dark and light periods.</p

Thermal photographs of a control rat and an exposed rat at air temperature of 31°C.

<p>The colors correspond to the temperature scale on the right.</p