1. A sleep mode indicator apparatus for a laptop computer, said apparatus indicating to users that said laptop computer being in sleep mode, said apparatus comprising: a CPU for causing said computer to enter into sleep mode; a micro-controller coupled to said CPU for computer operations during sleep mode; a LED circuit coupled to said micro-controller for generating electrical pulses to energize a LED indicator, said electrical pulses including a repetition of a series of PWM pulses occurring at a frequency, each pulse having an identical peak current level, said electrical pulses further including pulse Widths varying in accordance with a non-linear duty cycle function.