For hypothesis 1
Participants were to report to the lab before their normal bed time, and were instructed to not drink caffeine or alcohol. They went to sleep in a dark quiet room, and an EEG machine was attached to their face and scalp (In order to gauge the depth of sleep, REM or non-REM) and eyes (To detect eye movement while sleeping). The participants never had any contact with the experimentter, and were not told if they were woken during REM or non-REM sleep. They were trained, when awoken by the bell, to describe their dream in detail, and if they either could not remember, their dream, or gave a less than satisfactory description, the dream was marked as 'No dream recall'.
The participants were woken according to a schedule, with two woken at random, one was woken three times in REM, followed by three times in non-REM and so on. One participant was woken randomly, but was told that he was only to be woken during REM sleep. Another participant was woken at the experimenter's whim.