Motor conditioned reaction was studied at different sleep phases in 13 subjects by EMG and mechanogram parameters compared to SGR and EEG. During paradoxical phase motor conditioned reaction appeared more often than in the slow-wave sleep, but in a reduced form. At various sleep stages the motor conditioned reaction regularly appeared at the background of the rise in the level of cortical functional state before conditioned stimulus. At all sleep stages completed motor reaction is fixed in the consciousness. However, amnesia of conditional stimulus perception and of motor reaction to it is rapidly developed, in particular in the slow-wave phase.