A recent Nielsen study was conducted monitoring the use of smartphones, tablet pcs, and e-readers and where and when they are most commonly used. E-readers are quickly replacing books in the bedroom, with more than 60% of their use taking place in the bedroom. Smartphones and tablets also make an appearance in the bedroom, taking up about half of their usage. Smartphones are used 68% of the time while watching television, and tablets are used 70% of the time. E-readers are only used 35% of the time while watching television. The study was based on 12,000 owners of these devices, and it is speculated that the majority of the tablets were Apple iPads, and the majority of the e-readers were Amazon Kindles.