For an evaluation of the efficacy of noise in the different conductance, we firstly have examined the noise effects on the slow repolarizing variable of two coupled neurons (Hcrt/ox and Glu); two different noises with the same intensity as defined in (12) are added to the right of (4) at the same time; the amplitude of external current input is still set to A = 0.46 [micro]A/[cm.sup.2] as subthreshold stimulus. The simulation results demonstrate that both of the neurons of sleep-wake cycle model are excited (wakefulness) all the time without sleep when noise intensity D > 0.00002, seeming to be losing sleep.
With the amplitude of external current input still being set to A = 0.46 [micro]A/[cm.sup.2] as subthreshold stimulus, the proper noise added to the slow repolarizing variable of two coupled Hcrt/ox and Glu neuron can produce the similar regulation function (a).