Why is that when  I’m driving out to my mum’s house, which is only about a 15 min car drive away I get so tired. I can drive the 90ish miles to our holiday destination but 10mins out the road and I’m ready to keel over. This is why I HAVE to have a cup of tea when I go out there; to wake me up enough for the journey home again.  Could it be because I’ve driven that way at least once a day for the last 12 odd years? I find it very strange.