Actigraphy describes a method for monitoring human (and also
animal) activities. The recorded activity patterns are used to
determine phases of activity and phases of rest/sleep.  But
probably the most important use of actigraphy can be found in
sleep research. Its main purpose is to substitute or complement
classical Polysomnography (PSG), since the required environment
and devices are expensive. The main purpose of PSG is to measure
the different sleep stages during sleep.  Research around
actigraphy as a substitute for PSG started in the late 70s and
continues today, and research results have shown that actigraphy
is suitable to analyse sleep patterns.  WakeApp’s unique sleep
scoring algorithm is based on the latest findings from sleep
research concerning actigraphy and was adapted for the iPhone.
Intelligent Wake-up Window  The orange area at the end of the
movement graph above marks the 30 minute wake-up window. A
movement must be strong enough to reach the orange area in order
to trigger the alarm. The