DeGennaro_MultipleAwakenings

Twenty subjects (age range 18-30) were involved in the protocol.All participants signed informed consent for the collection and treatment of data prior to participating to the experiment. Each subject participated in two experimental sessions structured as follows: a) EEG montage; b) subjects were instructed to consider any distinct mental activity occurring during sleep as a dream experience; c) polysomnography (PSG) with planned-provoked awakenings; d) final morning awakening. <br> In order to ensure comparability between the two experimental nights, each subject was required to keep regular sleep-wake schedule during the week preceding the experimental session. The compliance was verified by a sleep diary. Experimental sessions were separated by at least one week. Subjects were also requested to abstain from caffeine and alcohol during the day of experimental session. The timing of the sleep–wake schedule during the protocol was adjusted to individual sleep-wake habits. <br> Multiple awakenings were planned for each sleep cycle from REM sleep or NREM sleep after at least 5 min without stage shifts by calling out the first name of the subject through an interphone system. Participants were asked to report if they had (REC condition) or had not (NREC condition) a dream experience just before awakening. We did not collect dream contents to avoid an excessive activation that can interfere with subsequent sleep. <br> <br> <br> --DREAM categorization procedure-- <br> 2 = dream experience, 0 = No dream experience, -2 = No Experience or Experience without recall <br> <br> ---Technical details--- <br> Derivations with noise/artifacts are reported in the csv file. <br> --Data acquisition-- <br> The PSG was recorded in a sound-proof, temperature-controlled room inside the sleep laboratory. A Brain Amp MR plus system (Brain Products GmbH, Gilching, Munich) was used to record EEG throughout the nights at a sampling rate of 250 Hz. The 28 unipolar EEG derivations placed following the international 10–10 system (C3, C4, Cp1, Cp2, Cp5, Cp6, Cz, F3, F4, F7, F8, Fc1, Fc2, Fc5, Fc6, Fp1, Fp2, Fz, O1, O2, Oz, P3, P4, P7, P8, Pz, T7, T8) were recorded by using an elastic cap (Easycap, Falk Minow, Munich) with sintered Ag–AgCl electrodes. The cortical EEG signals were referenced online to the averaged mastoids (A1, A2) and the ground electrode was located anterior to Fz (Fpz). Electrooculogram (EOG) and submental electromyogram (EMG) channels were also recorded and referenced to mastoids (A1, A2). EEG signals were analogically high-pass filtered with the time constant of 0.3 s and lowpass filtered at 30 Hz. A notch filter was applied (50 Hz). Electrode impedance was fixed below 5 kΩ. Language: Italian. <br> --Data preprocessing-- <br> N/A