The mind thinks, "I'll close the door - lock it - then I'm going to undress and go to bed."
Well, you walk over to the door
before the walk is finished you're reaching for the door before the door is closed you reach for the key
before the door is locked you're turning away - while you're walking away you undo your tie
and before you reach the bureau you have your tie off.
In other words, before you know it you're undressed - and you've done it in one thought, "I'm going to bed."