The Alice Host System featuring the Alice 3 Calvin amplifier is a polysomnograph system that packs big power into a small, lightweight package that is used with a computer.  Its 28-channel capacity handles standard polysomnographic signals and includes 8 auxiliary inputs to receive data from a variety of ancillary devices such as oximeters and pressure therapy units. The Alice Host System uses Alice Sleepware Software that provides full real-time functionality while acquiring sleep study data simply, accurately and efficiently.