REM: Sleep is an experimental mobile application centred around the effects of environment on one’s overall sleeping experience. At its most basic level, it can be used as an alarm clock and digital dream journal, but ultimately users can use preset themes to influence their sleep in order to have better control over the way they dream. In addition to tracking the user’s movements, heart rate, and overall wellbeing during their sleep, users are able to sleep feeling self-assured and wake up feeling rested.