Sleep is a very mysterious phenomenon. We don’t experience it consciously. But we can use tools to track our sleep and gain insight into what makes a night a good night. SleepGalaxy is an artistic visualisation of 35 nights of sleep during the period of 5-2-2016 and 24-3-2016. Sleep data was collected using the Emfit QS device. Sleep data was coupled with other variables to discover the connection between lifestyle and sleep quality. Lifestyle data was collected manually using a Google form. The poster displays in a provoking way the relationships between the various parameters while at the same time expressing the endless mystery of the night.