Nature staff discuss some of the week’s top science news.
Dan told the BBC the monitoring and caring for a severely disabled child meant neither he or his partner got much sleep, were exhausted and also had two other children to care for.
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London has the highest number of rough sleepers -1,277 - but the rate of rough sleeping rose steepest year-on-year in the north east of England, where numbers increased by 31% to 162.