I think i'm a shade under 6foot.
Did you know that during the day you spine compresses and you can shrink about and inch form when you got up in the morning
*NB i think there is a limit so i doubt extreme shrinking is a symptom of insomnia
That's a bit misleading. I've not done any research on this but your spine cannot compress, it's bone. The bit that may 'compress' would be the ligament/muscle between the vertebrae.