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

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.