Home > Newsletters > Daily: Love or hate Earth Hour? > Daily Dose: Are you happy in your job? > Health-in-Motion 31 August 2016 We all need to sleep regularly We all need to sleep regularly. But why? One popular scientific theory has it that sleep evolved to allow connections (or synapses) between neurons in the brain to be pruned down, thus making room for the myriad of brand new memories that will accumulate during the following day. The idea received support recently when US scientists found that synapses in the brains of mice were 18 percent smaller after a period of sleep than they were before. Think of it as a natural and necessary process of mental housekeeping. 0 More in Newsletters Want to improve your teenager’s eating habits? More: Daily Dose: Are you happy in your job?Health-in-Motion advertisement Other news Lifestyle Why is altitude sickness so dangerous? Medical Zika may be passed on through tears and sweat Medical 'The Pill' may raise depression risk Medical FDA approves 1st 'artificial pancreas' for type 1 diabetes News SURVEY: Are you happy in your job? Medical Statins aren't the only way to lower cholesterol From our sponsors How to still have a good life with diabetes Eye-Q: R50 off! Lose weight Otrivin Menthol relieves sinus congestion Live healthier Love coffee? Your heart may too » What to eat for white teeth Bad foods for teeth-whitening Do any of these drinks cause your teeth to hurt? Savour your coffee – with a bright smile Here's how to stop coffee from staining your teeth while enjoying all its health benefits. Get your groove back! » Get your move on! Morning run? 5 exercises to start your summer fitness regime 6 easy ways to make your workout fun again Some inspiration to make sure your workout routine don't become tedious.