HUMAN SLEEP -- Naturally each person has his/her own individual sleeping pattern, but there are some factors that mark the sleep of a healthy grown-up:Each person goes through various sleeping cycles during sleep.Each sleeping cycle, which lasts approximately 90 to 110 minutes, alternates with deep-sleep, light-sleep and REM-sleep.REM (Rapid Eye Movement) is the phase in which you dream. Sleep gets less deep towards the morning and REM phases get distinctly longer.There are also sleeping differences between the sexes. Women move more in their sleep but less intensive, whereas men move less but more intensive.Both REM and deep sleeping phases are marked by almost no movements. If you move from a deep sleeping phase into a REM-phase and from a REM-phase into a deep sleeping phase your body movements get more active.This is where aXbo comes in. The physical activity that characterizes the various sleep phases is monitored, so that aXbo is able to calculate the optimal point at which to wake you.Package includes: support for 2 people; 2 x wristbands; 2 x sensors; charging cable; PC transfer/charging cable; batteries.