We know young people sleep rough every night - in parks, stairwells, under bridges and worse. But there are thousands more you don't see - spending the night on buses, on sofas or in the homes of strangers. They're escaping abuse, violence, gangs and fear. Many are homeless because they can't live with their family, or they have no family. More than 150,000 young people ask for help with homelessness every year.