Eak a spider!

When I woke up this morning I felt a slight tickle on my neck, thinking it was hair I tried to brus it of and suddenley felt the tingly feeling WALK down my shoulder. I Jumped up with a shiek to notice that I had an eight legged visitor in my bed. One of those small, long legged thingys. Even though it did not hurt me I was starteled to the point where I felt forced to flush it down the toilet. Why did this happen? Don't I move my stuff around enough? Do I have to much things? Don't I dust enough? Do I need to vacum more often? I do not want my precious sleep disturbed by any nasty creepy crawlies! What can I do to avoid it?