Night-day-night sleep-wakefulness monitoring by ambulatory integrated circuit memories

A medium-sized portable digital recorder with fully integrated circuit (TC) memories for sleep monitoring has been developed. It has five amplifiers f or EEG, EMG, EGG, ECG, and a signal of body acceleration or respiration sou nd, four event markers, an 8 ch A/D converter, a digital signal processor ( DSP). 192 Mbytes IC flash memories, and batteries. The whole system weighs 1200 g including batteries and is put into a small bag worn on the subjects waist or carried in their hand. The sampling rate for each input channel i s programmable through the DSP. This apparatus is valuable for continuously monitoring the states of sleep-wakefulness over 24 h, making a night-day-n ight recording possible in a hospital. home, or car.