Researchers have found that part of our brain keeps a lookout when we sleep in a new environment. This "first-night effect" is the reason we often can't get a good night's sleep in new places, such as hotel rooms or aeroplanes.

Remember all those times as a kid when Mum would yell at us to ‘Sit up Straight!’ while we were watching TV. Or the times she snuck up behind us, pulled our shoulders back and pressed her hand into the small of our back to correct our posture?

More than Just pain in the neck