DOI: 10.6084/m9.figshare.14899506
title: DeGennaro_YoungAdults

description: <br> Dream EEG and Mentation (DREAM) dataset ======================================= <br> <br> Dataset information ------------------- <br> - Common name: Dream_YoungAdults - Full name: DeGennaro_YoungAdults - Authors: Serena Scarpelli, Luigi De Gennaro - Location: Rome, Italy - Year: N/A - Set ID: 11 - Amendment: 0 - Corresponding author ID: 8 <br> Previous publications: Marzano, C., Ferrara, M., Mauro, F., Moroni, F., Gorgoni, M., Tempesta, D., ... ; De Gennaro, L. (2011). Recalling and forgetting dreams: theta and alpha oscillations during sleep predict subsequent dream recall. Journal of Neuroscience, 31(18), 6674-6683. <br> Correspondence: luigi.degennaro@uniroma1.it <br> <br> Metadata -------- <br> - Key ID: 12 - Date entered: 2023-03-13T06:16:28+00:00 - Number of samples: 65 - Number of subjects: 65 - Proportion REM: 46% - Proportion N1: 0% - Proportion N2: 54% - Proportion W: 0% - Proportion experience: 62% - Proportion no-experience: 38% - Proportion healthy: 100% - Provoked awakening: Yes - Time of awakening: Morning - Form of response: Structured - Date approved: 2023-03-13T06:19:06+00:00 <br> <br> How to decode data files ------------------------ <br> Please note that the files contain the last 5-min of each night recording. <br> <br> ### Treatment group codes ### <br> N/A <br> <br> Experimental description ------------------------ <br> Data for this analysis were obtained by selecting an ad hoc sample of 65 university students [35 males (M) and 30 females (F); mean age, 23.6 ± 2.1 years]. Subjects were selected from those who participated to distinct protocols (De Gennaro et al., 2008, 2010; C. Marzano, M. Ferrara, F. Moroni, and L. De Gennaro, unpublished observations), on the basis of the following study-specific criteria: (1) polysomnographic (PSG) recordings of 2 consecutive nights (for adaptation and baseline, respectively) of undisturbed sleep; (2) the collection of a sleep and dream diary (see below) after morning awakening in the second night; and (3) the absence of stage shifts in the last 5 min of sleep preceding the provoked awakening at the end of the second night. <br> Additionally, the subjects had to meet the following general criteria: normal sleep duration and schedule; no daytime nap habits; no excessive daytime sleepiness; no other sleep, medical, or psychiatric disorder (as assessed by a 1 week sleep log and by a clinical interview); a habitual sleep time between 12:00 A.M. and 8:00 A.M. plus or minus 1 h; and an average sleep duration of 7.5 ± 1 h hours per night. <br> In such a way, we considered 35 (16 M and 19 F) subjects awakened from stage 2 sleep and 30 (19 M and 11 F) from REM sleep, also taking into consideration the need to have comparable sizes for the groups recalling and nonrecalling dreams after either REM or stage 2 sleep. <br> The protocol of the present study was approved by the local Institutional Ethics Committee and was conducted in accordance with the Declaration of Helsinki. All subjects had previously given their written informed consent for the collection and treatment of data. <br> For each subject, a polysomnogram was recorded in a sound-proof, temperature-controlled room after an adaptation night. Hence, the recordings were obtained during second nights in the sleep laboratory, and any procedural aspect was completely identical to the first adaptation night. The subjects’ sleep was undisturbed during the night. Awakenings were scheduled from stage 2 sleep (n = 35) or from REM sleep (n = 30) after at least 5 min without stage shifts (by calling out his/her name and entering in the sleep room). The decision to wake up the subject was taken by the sleep researcher who examined PSG recording online, and the absence of stage shifts over the last 5 min of sleep was then confirmed by an independent expert, who off-line scored PSG recording. <br> Just after morning awakening, subjects were requested to fill out a sleep and dream diary (De Gennaro et al., 2010), to collect subjective estimates of sleep characteristics (sleep onset latency, number of awakenings, total sleep time, sleep quality) and of dream recall, namely the feeling of having or having not dreamt. <br> Language: Italian <br> <br> ### DREAM categorization procedure ### <br> Dream Recall = 2; Absence of dream recall = 0 <br> <br> Technical details ----------------- <br> N/A <br> <br> ### Data acquisition ### <br> A VEGA 24 polygraph (Esaote Biomedica) was used for polygraphic recordings. EEG signals were analogically high-pass filtered with a time constant of 0.3 s and low-pass filtered at 30 Hz. The 19 unipolar EEG derivations of the international 10–20 system (Fp1, Fp2, F7, F8, F3, F4, Fz, C3, C4, Cz, P3, P4, Pz, T3, T4, T5, T6, O1, O2) were recorded from scalp electrodes with averaged mastoid reference. <br> The submental EMG was recorded with a time constant of 0.03 s. <br> Bipolar horizontal eye movements were recorded with a time constant of 1 s. The bipolar horizontal electrooculogram (EOG) was recorded from electrodes placed about 1 cm from the medial and lateral canthi of the dominant eye. Impedance of these electrodes was kept below 5 kOhms. <br> <br> ### Data preprocessing ### <br> The files have been converted from txt to edf.