Never having been one to fall asleep as soon as my head touches the pillow (I wish!), I often find myself thinking more than I ever do during daylight hours about anything and everything. This, of course, has its advantages. Being fairly introvert at times, I enjoy just lying in my room having some peace and quiet (sad, I know - I'm supposed to be the teenager!), and having the time at night to think through everything keeps me fairly organised and calm.
It has direct consequences the following morning! I am not a morning person at the best of times (consider that a warning!), and thinking means that was awake at night when I should have been asleep, and therefore I am tired!
Also, once the brain starts thinking, it takes a while to deactivate, so to speak. Which means that I waste sleep time, and am even more tired in the morning. For instance, right now, despite having been shattered for most of the day, I am blogging in the hope that my fully-awake brain will want to go to sleep!
Life would be so much easier if we didn't think at all...