Sleep is an important part of life, with an individual spending an estimated 32 years of her life asleep. Despite this importance, little is known about life satisfaction and sleep duration. Using German panel data, it is shown that sleep is an important factor for life satisfaction and that maximal life satisfaction is associated with about eight hours of sleep on a typical weekday. This figur...

Many factors have been advanced to predicate the sustainability of bike sharing system (BSS) and usage, such as fleet size, number docking stations, payment type financial support, but there few studies that examine survival duration BSS’ operation. Therefore, this study investigates determinants duration, using monitoring map respective annual report data from 106 cities around world. Three ca...