Tesco is ending 24-hour shopping at 76 of its stores - around one in five of those currently open around the clock. The company says the growth of online shopping means that certain shops had few customers during the night. Normal night time activities - such as refilling shelves - will continue in the supermarkets so Tesco says the impact on employees will be "minimal". The move is Tesco's latest effort to turn around its business which has been hit by challenges on several fronts. The outlets affected will close between midnight and 6am and four hundred staff will be "affected". Tesco says it will do its best to make sure all staff affected are "found a new position either in their existing store or stores local to them".