Why sleep matters each and every night

When I meet a client for the first time, I always ask about sleep habits.  How many hours do you get per night?  Do you fall asleep easily?  Do you stay asleep once you’re asleep? 
Sleep is one of our most important body functions to keep everything in sync and sadly, it is chronically undervalued in today’s 24/7 world.  Research says adults need 7 to 9 hours per night, however about 40 per cent of us get less than this each night.