The eye movement detection and decoding can be coupled to an action output. As described in the SCF, an action output can basically be anything programmable. An obvious action output example can be a stimulus control.
The Sleeator 2 offers the feature of controlling the stimulus using eye movements and Morse code as follows: Looking three times to the left (Morse code: three times short, thus a Morse “S”) (re)starts generating a stimulus with auto-increasing intensity. This is helpful in case the sleeper is lucid, but the REM detector has for some reason not detected REM sleep or the waiting time threshold is not reached yet.
Equivalently, Morse code “O” (three times right) would stop stimulus generation. In case the sleeper experiences dream instabilities or has the fear of waking up because of the stimulus, this option can be a way of solving the issue. Additional stimulus control options implemented into the Sleeator 2 are the fixation of stimulus intensity to the currently used value in case of auto-increasing stimuli intensity (“M”, two times right) and the decrease of stimulus intensity (“T”, two times left). However, qualifying the before mentioned, these action outputs have been tested only briefly during wake state and not yet during a real sleep communication.