In Depth: Should we unplug our chargers each night?

If you own a smartphone of any description then you're probably familiar with seeing the battery warning level light flick on at some point during the evening. It's now become standard practice for phones to be charged up at least once every 24 hours, and the easiest time to do that is overnight when they're sat still doing nothing but waiting for the morning.Is this really the most sensible option, though? Are we causing permanent damage to our handsets by keeping them charged for much longer t